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Schedule Mass Emails

You can now schedule a mass email in Gmail to be sent at a future date and time.

Scheduling a mass email in Gmail with GMass

Schedule an email for the future

Access the Scheduling settings by clicking the GMass “arrow” to open the GMass Settings box when you’re composing a mass email.

You can choose from a list of pre-configured future times, or you can enter a custom date/time as well. All times are in the local timezone of your computer.

After you have selected a date/time, click the main GMass button as normal to schedule your email. At the scheduled time, your emails will be sent.

If, after scheduling an email, you want to alter the date/time or want to just send it now, find the email in your Drafts folder. All scheduled GMass campaigns will also have the label “GMass Scheduled” applied to the Draft. From there, click the GMass settings “arrow” again, and adjust the date/time or choose now, and afterwards, click the main GMass button again.

You can also edit the campaign before the scheduled send time or adjust the other settings, such as Open Tracking or sending as new messages versus replies.

After the mass email has been sent, the original draft with the label “GMass Scheduled” will be deleted from your account.

Scheduling an auto follow-up series in GMass

Scheduling auto follow-up sequences in GMass

You can also fine-tune the scheduling on your automated follow-up sequences with GMass. As you set up each email in your auto follow-up series, schedule when you want to send the email (relative to the first email in the series) and set the time of day to send the follow-up.

You can use the skip weekends feature in the Schedule settings if you only want your follow-ups to go out to contacts on weekdays.

Scheduling in GMass versus Gmail’s built-in scheduling

Google held out a long time on adding scheduled sending to Gmail — they didn’t roll out their Scheduled send feature until 2019.

At GMass, we’re always working on improving our scheduling tool to make it far more powerful than that native Google tool (or a lot of the third-party scheduling tools out there, most of which have stopped development since Scheduled send debuted in 2019).

With scheduling for automated follow ups, the ability to skip weekends, and intelligent sending to make sure Gmail’s sending limits don’t get in the way of your email schedule, we hope you’ll find GMass to be the ideal option for scheduling your emails — whether it’s one email, 1,000 emails, 100,000 emails, or an ongoing automated series.

You can download GMass at the Chrome web store to get started today for free.

Ready to transform Gmail into an email marketing/cold email/mail merge tool?

Only GMass packs every email app into one tool — and brings it all into Gmail for you. Better emails. Tons of power. Easy to use.


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  1. Hi. I am fascinated by this GMass extension for Gmail. Infact I have been using it for my email communications as well. I liked the integration with Google sheets which helps me when I save my consolidated contact sheets in Google. However, I noticed that the schedule functionality doesn't seem to work fine. I believe I have not entered the time in the right format. Can you please confirm what is the time format that should be entered for custom date and time?

  2. I'm glad to hear that you like GMass!

    When scheduling, you can choose "Custom Date/Time", and then modify the default date/time that shows up. That way you don't need to worry about the format. Just modify it in the format that is given.

    Just for your information, the format should be:

    10/29/2015 10:30pm -05:00

    That means October 29 at 10:30 PM at 5 hours offset from GMT.


  3. Im from India. Now if current time is 6.20pm and i want to send mail at 7pm then the format should be
    12/23/2015 6:20pm -5:30
    Am i right? If not please correct me.

  4. I believe I answered this over email, but there is a bug that prevents positive time offsets from being used. For India it should be "+05:30", but that will cause an error. For now, the workaround is to use "-00:00" and then set the time in GMT time. So whatever time in India you want to use, subtract 5.5 hours from that time and use that and then put "-00:00" at the end of it.

  5. Dear Sirs,
    I live inside -6 time zone but GMass Schedule Custom Date/Time feature says that it is -5 (06/06/2016 06:44pm -05:00). Why this happens? Is it right? Should I change it manually)?
    Thanks in advance.

  6. I scheduled an email. It's in my Draft box. Where does the label appear that says 'GMass Scheduled'? Thanks!

  7. I scheduled an email. It's in my Draft box. Where does the label appear that says 'GMass Scheduled'? Thanks!

  8. I’m interested in being able to schedule emails based on a certain date e.g.
    send birthday email on 23 june 2017
    anniversary email on 4july2017 etc.

    The emails and dates and event would be loaded in a spreadsheet.

    thank you for considering my idea,

  9. Hello Ajay,

    If I schedule the email with custom date and time so can it be repeated daily on the same scheduled time or will be deleted the draft after sending once. If i want to schedule time with daily repeat email on the same time is it possibe?

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  18. The time is not matching to what I want it to send .
    If I am Eastern Standard time how should I write the time that I want it to send for example 11:00 AM? Also when I click send now it does it it GMT time and i want it sent our time how do i fix that?

    1. Hi Fortune,

      If you schedule it, you must indicate what your timezone is based on GMT time. If I was sending an email scheduled for 11AM my time, I would schedule it as 08/01/2018 11:00am -05:00 since Eastern Time is -5 hours from GMT time.

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  21. Hi I posted this in another thread, but this topic is more relevant here.

    I want to me able to schedule time to send each email by entering date into Sheets column. Eg. delay sending by longer than 90 seconds, say 1 email every 10 minutes.

  22. How many emails can you schedule at a time? I have a very long sales cycle and it is important to maintain meaningful contact. 10 to 15 letters would be good.

  23. Trying to “schedule” 45 emails per day for the next 4 days. I have followed all the instructions and get a pop up telling me I am over the limit on a 24-hour rolling limit. I purposely scheduled them 25 hours apart from one another and still can’t accomplish this without the pop-up telling me about the limit and asking me to subscribe. What am I missing?

    1. Hi Paul,

      You would need to process that actual scheduling of each one on different days. The 50 emails per day include those you send and schedule on the same day. You can schedule 50 today but to go out on Saturday and another 50 tomorrow to go out again on Saturday so on Saturday 100 emails will be sent.

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  28. ya compre, pero necesito saber cuantos correos puedo enviar compre el paquete máximo para un usuario?

    1. Our subscriptions do not have usage limits. Although G Suite accounts are officially limited to 2000 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/

  29. i live in Korea (GMT +09:00). i set up the custom date and time. Our email list is so many. It will be taken 30day.
    The problem is that i set up 07:00PM +09:00. But every day, it is changed to strange time with 00:00 time zone. So now i change the time everyday. it is really crazy. even i am paid user.

    Please let me know how to solve it

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  37. Is it possible to gap between each email? when I will set 7pm so this will send all emails at 7pm but If would like to add 7pm then 7:02 then 7:04 like this way may I send emails?

  38. Hi!

    When I schedule mass emails and the will be sent over a few days, do I have to leave my computer turned on the whole time?

    Or will it send in the background?



    1. Hi Jacob,

      No, you don’t. Once GMass notifies you that your campaign has been scheduled, you do not need to be online or even have your computer on for GMass to follow-through with sending your campaign emails.

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  44. Hello,

    When scheduling an email, there is the option for “only send X per day”, which is great. But I’m wondering, can I go in and adjust this number afterwards, say – once the email account becomes more ‘warmed up’?


    1. Hi Paul,

      Yes, you can update your campaign. The changes made to your campaign would take effect for any pending emails.

  45. When using the scheduler, and you skip weekends it will save them to send on mondays. if you are using a filter for a date and it falls on a weekend?

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  47. This is the closest blog post I could find to the related topic – How does a scheduled email campaign for daylight savings time? Does it do it automatically, or do I have to adjust for it manually when setting it up? Eg. If I set the campaign today, to go out at 10 am EST on the 15th of November (DST on 7th), will it adjust for it automatically, or do I have to set it to 11 am to account for the time change?

    1. Hi Aditya,

      Yes, your first inference is correct. GMass will send it at 10AM for that timezone automatically.

  48. If I have a campaign that will last several days (only 50 emails/day with over 1000 emails) and simply schedule it for now, at what time will the first email be sent the following day? 0:01 or at the same time that I said “now” so 8:46 or so.

    1. Hi Alex,

      Succeeding batches of 50 would start at the same time as the initial batch which would be at 8:46 AM/PM everyday until all emails are sent.

  49. I followed the scheduling instructions but nothing is showing on my sent message. I had to stop the warm running to check if that’s the reason but still no luck.
    Where can I see the email sent ?

  50. Auto follow-up is not working at all. I scheduled it for 3 levels. It is showing me when I click on the followup option but it doesn’t work at all.

  51. Whenever we schedule emails to be sent out, the tags do not work. For example, on the subject, we enter the tag for {Brand} so that it will show the brand name. It works when we send out the emails but when scheduling emails, it does not. I have already tried manually typing the tag, pasting it, and filling it in using Gmass pre-set. Please help as this defeats the purpose of scheduling emails when we have to do them manually. Does anyone have the same issue?

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