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 or multiple SMTP servers 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 Address | Subject | Follow-up Stages | Recipients | Open Rate | Replies | Date |
|---|---|---|---|---|---|---|
| katierose@xxxxxxxxxxxxx.com | N_w C______g D____s To M__e Y__r L__e E_____: L_____r H_____s S___e & N____k C__e K_t | 0 | 4,271 | 85.3% | 1 | 07/29/25 |
| katierose@xxxxxxxxxxxxx.com | T_e W_t & D_y W____n P____e B___h f__m S___H Is S__e F_r A_l H__r T____, A T__e G______g E_______l | 0 | 3,305 | 80.7% | 4 | 07/30/25 |
| katierose@xxxxxxxxxxxxx.com | T_e #1 B___h on A________w in Y__r F__l S______e L____p | 0 | 3,503 | 68.9% | 10 | 07/29/25 |
| katierose@xxxxxxxxxxxxx.com | R_____h Y__r K_____n G__r F_r T_e N_w S____l Y___. K___i B___d B_g K___s B____, F____s & V_____s F_____r F_r B__y S____l W___s | 0 | 2,851 | 68.7% | 5 | 07/31/25 |
| katierose@xxxxxxxxxxxxx.com | Y__r A_____e C____e Is M_____g A H__e E______: O_____l G_____s to W___r R____! T___s A_______c P_______r C____e M___r D______s T_e P_____t C_p E___y T__e | 0 | 4,141 | 64.1% | 12 | 07/31/25 |
| sarah@xxxxxxxxxxxxxxxxxxx.uk | {_____________________s P_____m I_________: EU F__d L_w a_d R_________s on F__d S____y C__________, L_______g a_d H____h C____s | 0 | 10,001 | 51.9% | 0 | 08/01/25 |
| katierose@xxxxxxxxxxxxx.com | H____r M____r C________s N______l Y__a A_______s M___h w__h E___________, E______y C_____d Y__a E________s | 0 | 3,579 | 51.5% | 4 | 07/31/25 |
| c.chavez@xxxxxx.mx | E_______o P_______s U___i E________e | 1 | 21,687 | 50.8% | 0 | 07/29/25 |
| noreply-campaigns@xxxxxxxxxxxxx.com | Y__r c___n b____y f___s d_____e t_e s_______t t__s f__l  | 2 | 2,843 | 50.5% | 61 | 07/28/25 |
| megha@xxxxxx.ca | R_: {_________} - f_______g up f__m my e___l - 30 J__y 2__5 | 1 | 2,445 | 48.7% | 373 | 07/30/25 |
| katierose@xxxxxxxxxxxxx.com | T__s A_________l A________g F__e C___m H_s H_______d T_e P___r of G_______d B__f T_____, B______, C______n P_______, H________c A__d & V_____n C | 0 | 3,910 | 43.9% | 4 | 07/29/25 |
| kai@xxxxxxxxxxxxxxx.com | {____t N____, S____l S______y C__s C___d H____n S____r T__n Y_u T___k | 1 | 4,985 | 42.3% | 35 | 07/28/25 |
| freya.jane@xxxxxxxx.ai | i_________i <> {______y N___} | 4 | 2,269 | 42.1% | 35 | 07/28/25 |
| anup@xxxxxxxxx.ai | T__n r______t p___e c___s i__o t______g t___s a_d r_____e f_r y__r d_________. | 3 | 5,580 | 40.3% | 5 | 07/29/25 |
| fernando.e@xxxxxx.mx | A_, R___s X y M_____s | 0 | 6,560 | 39.8% | 1 | 07/30/25 |
| dr.thomas@xxxxxxxxxxxxxx.com | ? a_y q__________. | 2 | 3,085 | 38.5% | 41 | 08/01/25 |
| lily.businessdata7@xxxxx.com | {____t N___} | M________t C________g B_B L___s | 1 | 2,244 | 38.3% | 6 | 07/29/25 |
| info@xxxxxxxxxxxxxxxxxxx.com | {_______________g S_______c C___________n in I____, M_. {____t N___} {___t N___} {______________. {____t N___} {___t N____, C_________g an I________t O_________y f_r D________n {______________. {____t N___} {___t N____, P_______l C_________n O_________y in I___y {__________________g P__________l A_______t in I___y – M_. {____t N___} {___t N___} {________________o M_. {____t N___} {___t N____, O_____g a D______e on C_____l D_____________d s____} | 6 | 2,677 | 37.9% | 28 | 07/28/25 |
| tracy.schario@xxxxxxxxxxxx.com | {_____C 2__5 A_____} | 2 | 4,011 | 37.1% | 18 | 07/29/25 |
| mike@xxxxxxxxxxxxxxx.com | F___l S__p to S____e Y__r {______y R______} F_____g – A____n R______d | 3 | 2,225 | 35.6% | 33 | 07/29/25 |
Steps to sending high volume cold email:
- Set up your G Suite account, and connect it to GMass.
- 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.
- Connect SendGrid, or your alternate SMTP service to GMass.
- When you launch your cold email campaign in GMass, set the SMTP option instead of Gmail.
- Configure your auto follow-ups.
- 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:
- Sometimes we allow users to use our SMTP service — but typically for cold email that isn’t opt-in, we don’t.
- There’s a fiverr gig these days where someone will help you configure a SendGrid account for use with GMass.
- 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.
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Ajay is the founder of GMass and has been developing email sending software for 20 years.
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?
Using SendGrid to send cold emails in bulk, the account will soon be banned, which won’t work.
Great. I am going to go with GMass.
Great article. Do you think the age of the domain and/or the email address affects the results when using GMass
and SendGrid?
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.
gostaria muito de adquirir esse projeto de envios frios em massa
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?
Hello GMASS,
Could you please provide me with alternative methods to pay my credit card? I’m experiencing some buffering issues and it’s not giving me any results.
If you provide me GPAY option or UPI option that will be easy for me to make payment.
Hi, I read the different posts on SendGrid account for use with GMass. I have the free GMass
and I want to send more than 50 emails a day. How many emails can I send with the $25 a
month with the GMass? Is there a fee for the SendGrid too?