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How to send high volume cold email [beyond Gmail’s limits]

High Volume Cold Email

If you’re a cold emailer using any cold email platform other than mine, you’re likely subject to limits in the hundreds of emails per day. For most people, that allowance of a few hundred emails/day is enough, since it’s quite hard to find more than even 100 targeted prospects’ email addresses per day, where your message is relevant enough to the prospect that it doesn’t seem spammy.

But, let’s say you’re just that good at finding leads and capturing email addresses. Let’s go crazy here for a second and say you’ve fine-tuned a process that brings in 5,000 new email leads per day, and every day, you want to email these 5,000 email addresses and set a follow-up sequence that sends every few days until they reply. Now you’re in deep, because not only do 5,000 new email messages need to send every day, but once the follow-up schedules start to kick in, you’ll actually be sending more than 5,000 emails/day, when you take into account the original message volume and the follow-up email volume.

So, given G Suite’s limits of 2,000 emails/day and most cold email platforms’ own limits, how can you accomplish this?

You could set up multiple G Suite accounts and eventually send 2,000 emails per day per account. However, as years of experience has shown, it doesn’t always work so smoothly, and often times G Suite caps an account’s sending volume at a level much lower than 2,000 emails/day. This can work for some users but won’t work for most.

Last year, I invented a way to integrate an SMTP service into a high volume cold email process such that you can send as many emails as you want through an SMTP server like SendGrid, while preserving the ability to detect replies and send follow-up emails to non-responders. We do this through a little bit of inventiveness in how we relay the emails through an SMTP and sync the data back to your G Suite account.

Recent High Volume Cold Email Campaigns

Here is a sampling of recent large cold email campaigns sent by our platform in the last few weeks. Included are the number of auto follow-up stages and the open and reply rates. Some of these were distributed in daily batches via Gmail and some were sent via a third party SMTP relay.

This cold email campaign data is updated daily.

From AddressSubjectFollow-up StagesRecipientsOpen RateRepliesDate
[email protected]P____e F____h V_______g H____y A_____t12,972100.0%14009/11/23
[email protected]🌟 E_____e Y__r H________e R_________t w__h S______________s E_______e D________! 🌟22,50098.4%509/13/23
[email protected]{________} m_____?22,00069.2%609/15/23
[email protected]{________} m_____?22,00066.8%509/15/23
[email protected]{____t N____, T___k y_u f_r a_______g o_r H__I W_____r12,06965.6%909/13/23
[email protected]{________} m_____?22,00063.9%609/15/23
[email protected]H_y {____t N____, Q___k c___k f_r O__n r__e42,22560.6%6909/12/23
[email protected]B_B S__S I________t O__________, R_____e g_________, $_M A_R a_d b___k e__n Q4 2__323,42460.4%10309/14/23
[email protected]D____t L____r h__e f_r B______s F____________. E__n If y_u w__e r______y f____d I c_n a_d W__L g_t y_u t_e f_____g y_u n__d f_r y__r b______s47,58755.6%2209/15/23
[email protected]{____t N____, C___d Y_u L__e It A__? �__�12,98655.5%909/17/23
[email protected]O______w A______s f_r B______g M_______s M____t R______h R____t F______t 2__3 -___022,65152.2%509/13/23
[email protected]"______" b______k13,28950.1%709/14/23
[email protected]N__s a___s u_e p_________n de c___________n33,07048.2%309/11/23
[email protected]A__e T_______t M____t A_______: I_______, T_____, a_d S________s R______h R____t f_r 2_____022,43047.0%009/11/23
[email protected]{_________s e____y m____t s______y32,28045.4%7209/13/23
[email protected]{____} S_______n f_r C___K S__R A____s 2__3 - A___y N_w216,89244.3%009/13/23
[email protected]O___r f_r {____} - {___}12,36139.9%7009/12/23
[email protected]{_________s u____e d____g B___k F____y32,73438.8%4209/11/23
[email protected]N_w s__g p______e o_________y w__h B_________!23,00138.2%2309/12/23
[email protected]B______a I______r E______e O_________y12,40134.8%2109/14/23

Steps to sending high volume cold email:

  1. Set up your G Suite account, and connect it to GMass.
  2. Set up a SendGrid account or any other SMTP service and subscribe based on the daily volume of emails you want to send. When determining daily volume, take into account the original message plus follow-up emails that need to go out per day.
  3. Connect SendGrid, or your alternate SMTP service to GMass.
  4. When you launch your cold email campaign in GMass, set the SMTP option instead of Gmail.
  5. Configure your auto follow-ups.
  6. Hit the GMass button to launch the campaign.

What happens next?

Even though your emails are being sent by SendGrid, you’ll still see a copy of each individual email in the Sent folder of Gmail. When someone replies, the reply will still be threaded to the same conversation as the email in the Sent folder. And if someone doesn’t reply, and a follow-up email sends automatically in a few days, that follow-up will also be threaded to the same email conversation.

But wait, I’m not technical enough to set up SendGrid!

If setting up your own SMTP service is too complicated, and you don’t want to bother with the implications of DNS records, SPF, DKIM, DMARC, and all the subtleties that are recommended for deliverability, you have a couple of options:

  1. Sometimes we allow users to use our SMTP service — but typically for cold email that isn’t opt-in, we don’t.
  2. There’s a fiverr gig these days where someone will help you configure a SendGrid account for use with GMass.
  3. You sign up for SendGrid and subscribe, and then send us your credentials and we’ll link GMass to SendGrid for you.

By the way, if you’re an advanced web developer and this all sounds to easy for you, you may want to read my technical review of SendGrid to take a look under the hood and see if you want to customize your SMTP process. That review is written specifically for advanced web developers. 

How high is our volume?

When you’re shopping different cold email platforms, ask them how much email they send. Then check our real-time counter for how much email we’ve sent. We’ve sent over 1 billion emails through Gmail and G Suite accounts. Not all of them were cold email campaigns, but a lot of them were.

Ready to send better emails and save a ton of time?

GMass is the only tool for marketing emails, cold emails, and mail merge — all inside Gmail. Tons of power but easy to learn and use.


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  1. Do I need the paid version of SendGrid? If so what particular feature is it that is not available on the free version that I am paying for? Is this something that would be resolved if I simply use HubSpot or MailChimp?

  2. Great article. Do you think the age of the domain and/or the email address affects the results when using GMass
    and SendGrid?

    1. Hi Peter,

      Yes, it could affect deliverability. Even though the emails are being sent using an external SMTP, the from address would still be tied to the email address’s domain. So the email address and domain’s reputation would still play a part on deliverability. However, we couldn’t say how big of a part it does play.

  3. i have a single gmail acount
    i want to send more than 5000 emails per day,
    can you suggest me in a easy way how can i send?

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