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Emails getting blocked? Take this one step to eliminate delivery issues.


GMass is a unique service in the email marketing space because it’s built on top of Gmail. That means, unlike a traditional email marketing service like MailChimp, GMass doesn’t have any email sending servers or sending IP addresses. All emails are sent from our users’ Gmail accounts and therefore through Gmail’s IP addresses. The benefit of this is that your emails are sent through the world’s highest deliverability servers, since virtually nobody blocks Gmail’s IP addresses.

This, however, doesn’t mean that our users are immune to getting blocked. If the content of your email is deemed spammy, then Gmail itself may block your account, or your recipients’ email servers may block your emails.

GMass doesn’t monitor its users

GMass intentionally doesn’t monitor its users. Meaning, accounts don’t need to be approved before you can start using GMass to send an email marketing campaign. Why don’t we police our users? Because Google does most of the policing for us. If you use GMass to send spam, it’s likely that Google’s automated systems will be triggered and your Gmail account will be terminated. It’s unlikely that we’d be able to develop a better algorithm than Google already has in place for detecting and terminating spammers.
However, even Google’s spam detection mechanisms might not be fast enough in some cases. Lots of spammers succeed in using GMass to send some spam out before Google notices and terminates the associated Gmail account.

Your emails could be blocked

Because of that, it’s possible for your legitimate emails to become associated with a spammer’s emails and for you to also get blocked. How are your emails connected to the spammer’s emails? If you’re using GMass’s open tracking, click tracking, or unsubscribe features, then a “tracking domain” is inserted into your email to allow those features to work. If you’re using open tracking, then an invisible pixel is placed at the bottom of your emails, and the domain referenced is the tracking domain. If you’re click tracking your links, the links are altered so that the GMass server is hit first to record the click, and that’s done by way of the tracking domain. Unless you’ve set up your own custom tracking domain, GMass uses shared tracking domains across accounts. Typical shared tracking domains look like gmss1.com or gm.ag or gmss1.net. They are variations of the word “gmass” with the vowels removed, using various Top Level Domain (TLD) extensions from .ag to .net to .com.

Some spam filters catalog domains that are commonly found in spammy messages, so if your emails contain the same tracking domain as the spammer’s emails, then your emails can also get blocked.

This screenshot shows an example of the role a tracking domain plays in your GMass sent emails. In this case, the tracking domain “gm.ag” is used to track clicks of the reddit link.

The simple one-step solution

 The solution is a simple one. Your accounts should use a tracking domain that is specific to just your email campaigns.

If you are able to add a DNS record for your domain…

You can easily set up a branded tracking domain for your GMass accounts that is based on your OWN domain name.

If you can’t add a DNS record or this is too technical for you…

If you don’t know how to manage DNS records, register a new domain from scratch for use with GMass.

Regardless of whether you have a Gmail account or a Google Apps account, you can take advantage of this capability.

That is the single most important step you can take to maximize your deliverability and avoid blocking issues.

Re-sending your campaign to those that blocked you

 After a tracking domain has been set on your account, you may want to resend your campaign to anyone that blocked you previously. Here is how to do that.
  1. I gave up using GMass a months ago because of email blocking. I think I need to try this out. Thank you!

  2. I using GMass but this month not working properly all Mail Delivery failed can you help me please. I'm working in email marketing.

  3. Maybe no much random in your letters?
    Stop block at this point is critical. Send by 300 per day.
    Some leads at send
    Sorry for bad english

    1. stop my emails from sending i sent over 4000 emails and i cant stop them,and i keep get bounced messages in my inbox

  4. What if I use an email address alias when sending GMass messages, i.e. I am log in in G Suite and GMass as domain1.com, but send email as /on behalf of my other G Suite email address of domain2.com, which is added in my G Suite settings as an alias. Which domain should be setup as my branded tracking domain for my GMass tracking, domain1.com or domain2.com?

    1. Either one! It doesn’t matter which domain is on your Tracking Domain – what matters is that it’s your domain and is distinguished from all other GMass users. If you want consistency of domains, then I’d use the domain2.com, since you’re sending with the alias of domain2.

  5. I sent a campaign to about 500 (batch sent 300 one day, remainder the next). Had scheduled a follow up for day 2. When followup started to run, they immediately came back “blocked”…the first 9. GMass attempted to send a total of 20. The next 11 came back as “bounce” from Google (not GMass) saying it was because I was “over my sending limit”. (Which I’m def. not.) I’ve had my Gmail account forever and probably could have even done the 500 at once if I’d wanted.

    I’ve been using GMass intermittently since it was first created years ago.

    I’m really concerned that MY email address has been blocked from sending to others. I can’t even send an individual email now. How do I find out the problem or what to do? I paid for the higher GMass plan. HELP!

      1. Hi Hugh,

        Though we try to answer inquiries in this blog as best as we can, we do have a support helpdesk that can be contacted in the instructions we send to all GMass users upon signing up.

        If you need assistance, you may contact our support team by going to gmass.co/g/support.

        1. wouldn’t I be better off not setting up/using a tracking domain if I’m sending emails that only require a recipient to reply or call rather than clicking link (the emails are personal one-one correspondence that contain no links

          1. Hi Andrew,

            You can turn off open and click tracking altogether and not use a tracking domain which would be just as if you clicked the regular send button.

  6. I am in the same situation as Kimberly. I sent a campaign to under 400 emails and my GMail account has been basically shut down by GMail since. I paid for your services. I thought you worked well with GMail. At this point, you have shut down my business. Please help!!!!! It has been three days and I can’t send one email.

  7. I want full refund..and cancel my account gmass and gsuite and all…i try to much and nothing…only 40 mail daily..i don’t pay for 40 mail daily..sendgris is a bs..i want full refund

    1. I am experiencing similar issue. May we know how to overcome the issue of emails going to receivers’ spam folders?

  8. I am concerned that it appears there are several people in these comments that are experiencing problems and not getting any response from Gmass? Why is this Gmass? Is Gmass monitoring this reply area? It appears to be abandoned?

  9. I just tried this for the first time and all messages sent to agents in one particular company were blocked. I’m not going to be able to use this if I can’t figure out a way around it.

    1. Hi Susan,

      You can eliminate this blocking issue by adding a custom tracking domain to your link tracking. The directions are found on this article.

      1. Hi Marvin

        I tried to add a custom tracking domain to my godaddy DNS CNAME page. Not sure if i have done it correctly.

        I read that if you add a custom tracking then this can help your sending ability.

        Please see the screen shot of my godaddy DNS page. http://prntscr.com/l98o6t

        Not sure if this is correct…..my domain name is asiansunrisebasins.info

        I then added email to the front of it email.asiansunrisebasins.info

        Then added to my godaddy DNS.

        Anyway this can be checked to see if i have done it correctly?

        thanks for your time Marvin

    1. Hy My,

      Yes, if you’re experiencing delivery issues, it is highly recommended to add your own custom tracking domain as outlined in this article.

  10. I bought g mass for Premium category and since yesterday I couldn’t send any emails and message mention that I had reached a limit for sending mail plz reply asap

    1. Hi Amr,

      Although Google Apps accounts are officially limited to 2,000 emails per day, we have noticed over time that there are other factors that affect the send limits for an account. Age is a huge factor in this, as Google limit accounts to lower sending capacity until the account establishes its credibility. This is a measure to prevent scammers and spammers from opening accounts and sending at full capacity. 

      There’s some more information about these limits and factors here: https://www.gmass.co/blog/how-many-emails-can-you-really-send-with-gmass-and-gmail/ ( https://www.gmass.co/blog/how-many-emails-can-you-really-send-with-gmass-and-gmail/ )

      We recommend that in situations like yours, users ‘warm up’ their account by sending smaller campaigns over time to establish a reputation for the account and the domain. We don’t want your behaviors to flag Google’s spam detectors and cause bigger problems for you down the line. The more you use your G Suite to send and receive, the more it garners reputation and sets usage behavior resulting in slowly increasing Google imposed sending limits. 

  11. If I am not using Gmass open tracking, click tracking, or unsubscribe features is there other benefit to setting up custom tracking domain?

    1. Hi Chad,

      Yes, having a custom tracking domain will change any URLs you may have in your email to use your tracking domain.

  12. Hi,

    I sent an email to 20 recipients. There are some opens and clicks but it says 100% blocked?

    Total Recipients: 20 download
    Unique Opens: 7 (35%) download
    Didn’t Open: 13 (65%) download
    Unique Clicks: 1 (5%) download (Not all links are tracked)
    0 (%) download
    Blocks: 20 (100%) download (How to eliminate blocks)

    1. Hi Jeff,

      I’ve forwarded your ticket over to Ajay for a closer look. He’ll be responding to you directly via email.

    1. Hi M,

      Tracking domains are reviewed manually so it does take a while for us to approve them. But once they have been approved, it will become active on your account in real-time.

  13. I want to see proof of your “deliverability” rates. I bought GMass only because my emails were getting stuck in the promotions tab in gmail recipients and I could not get it to show up in the inbox tab. After all this setting up I still do not see how many of my emails are showing up in the inbox and there is no counter anywhere that proves GMass has the highest deliverability rates around. I also have the same open rate as I do in Aweber with GMass, no difference at all. Where is the proof in your deliverability rates GMass?

    1. Hi Alex,

      Tracking domains are used when you’re using GMass’s open tracking, click tracking, or unsubscribe features, then a “tracking domain” is inserted into your email to allow those features to work. If you’re using open tracking, then an invisible pixel is placed at the bottom of your emails, and the domain referenced is the tracking domain. If you’re click tracking your links, the links are altered so that the GMass server is hit first to record the click, and that’s done by way of the tracking domain. Unless you’ve set up your own custom tracking domain, GMass uses shared tracking domains across accounts. The use of having your own custom tracking domain is so if your emails contain the same tracking domain as the spammer’s emails, then your emails can also get blocked.

      You would need to create a tracking domain by adding a CNAME entry in your DNS settings in your domain manager then setting this new tracking domain to be used with GMass. To learn more, please see https://www.gmass.co/blog/register-tracking-domain-for-gmail-mail-merge/

  14. Marvin is there time free users can send more than 50 a day? and moreover. I want you to know that since the inception of the Gmass, Gmail seems to be heavy/sluggish in movement. Can you do anything to make it as sharp as before Gmass?

    1. Hi Scott,

      No there is no time limit. You can use the free version of GMass indefinitely.

      GMass actually has a very small footprint so it shouldn’t cause any lags or sluggishness with Gmail. Do you have other top-heavy applications installed outside of Google Chrome?

  15. I removed all tracking options and do not post unsubscribe link.

    Still, when I look back in: all mail, I see that a large portion, >30%, of 600 validated emails bounced back “not found.” Eventually 15 were blocked in a row prior to gmail announcing 170th email was over sending limit (on old personal account) having sent 250 the day before.

    What is going on with this? My mother in law needs this campaign completed right away.

    Please approve my SMPT request – but is this going to solve the problem?

  16. I opened a new email for our small church and sent out 250 emails BEFORE I heard about GMass. All of them were blocked. Then I found out about GMass and sent them out again using Gmass paid version…ALL of them were blocked again.

    Once an email is Blocked can I ever send that contact an email again? Do I need to shut down this Gmail account and start over? If it is blocked once does that make the email a “dead” email such that I can never send them anything?

    I don’t know how to do all the things you have asked….I contacted my IT person and I’m asking him to see if he can help set up these things you have suggested. But I don’t want to do all of that if my “contact’s email” is no good since it was Blocked.

    1. Hi JoAnn,

      If an email is blocked, this isn’t something with your account perse but is actually something that’s triggering your recipients’ email server’s filters. Could you try the following?

      Try sending to a small list for a test campaign using the same content, then disable click and open tracking to see if your emails are still being blocked. If it is not being blocked, adding a custom tracking domain will greatly improve your deliverability and resolve the blocking issue you’re encountering.

  17. Recently, I have purchased a G- mass subscription and when I’m trying to send emails the majority of the time it is bouncing and getting a block. I RECENTLY HAD A TALK WITH GOOGLE REPRESENTATIVE HE SAIDE THE UNSUBSCRIBE LINK YOU ARE PASTING BELOW YOUR EMAIL IS ADDING SOME MORE CONTENT ON ITS OWN AND GETTING MARK IT AS SPAM, I ALSO HAVE a GSUITE SUBSCRIPTION.

    I hope you look into this matter why your software is adding your own content marking it as spam.

    1. Hi Bhavesh,

      This is due to the tracking pixel which is added to your emails or the tracking link (if there are any links in your email body) that is used to track your opens and clicks. This is explained in the article above. Adding a custom tracking domain would resolve this.

  18. Hi. I use gmass paid plan. Recently I am facing a problem when sending a campaign. Here is my error message link https://dl.dropboxusercontent.com/s/l6tm4t3f5grk4or/Error%20Message.png?dl=0.

    In the meantime, I have send a message to support@gmass.zendesk.co. But I do not know the support team get message or create a support ticket for me yes or not. My gmass account is created by this email yuanyuanlu1984@gmail.com and I contact the support team from my Gmail account. When I send a message to the support team they return back with this message to me

    “Please read, especially if it’s your first time requesting support!

    The GMass support team has received your request (37360). If you haven’t already, please REVIEW OUR SUPPORT GUIDELINES (www.gmass.co/g/support) to make sure you’ve provided all the information we need to help you. If you want to provide more details, you can do so by REPLYing now.

    99% of the support questions we get can be answered by Googling “GMass + your question”. If you end up finding your own answer, just let us know that you don’t need our help anymore. Thanks!

    To add additional information, reply to this email.”

    Please help me to understand does this message confirm the activation of support ticket. If it is, how many days it will take to solve my issue?

  19. Helpful information. Fortunate me I found your website unintentionally, and I’m stunned why this coincidence did not happened in advance! I bookmarked it.

  20. I just want this to work. I need the service it promises, but all this setup is mentally tasking. Is there anywhere I can get some help?

    1. Hi Kale,

      Please contact our support team (gmass.co/g/support) so we can assist you directly and answer any questions you may have.

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