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How to edit a campaign

After you’ve launched a campaign, you may wish to edit it either before it actually sends or perhaps in between batches of sends.

To edit a mail merge campaign:

  1. Find the campaign under the GMass Scheduled Label.
  2. Open up the Draft for the campaign.
  3. From here, you can edit any aspect of the campaign, including the Subject, Message, or any of the campaign settings under the GMass Settings arrow, like Open Tracking, Click Tracking, the send time, and auto follow-up settings.
  4. After you’re done making changes, click the green SAVE Changes button. Alternately, you can also click the main GMass button. Both have the same effect.

If you can’t find the campaign under the GMass Scheduled Label, that means it has already finished sending. However, it is possible that the campaign’s associated auto follow-up emails have NOT finished sending. If you wish to modify the auto follow-up settings for a campaign but the original message for the campaign has already finished sending, you can also edit the campaign’s settings under the GMass Auto Follow-ups Label.

Frequently Asked Questions

Q: I see the Draft for my campaign in both the “GMass Scheduled” Label and the “GMass Auto Follow-ups” Label. Does it matter from where I make changes to the campaign?

A: No, it does not. You can make changes to your campaign from either Label. GMass stores a campaign’s data in a Draft, and you can make changes to the campaign wherever you find the Draft. Based on the type of campaign, that may be the GMass Scheduled Label or the GMass Auto Follow-ups Label. You can also find the Draft just in the Drafts folder of Gmail.

Q: Can I change the Google Sheet that is associated with a campaign?

A: Yes, you can. But be careful — if the new Sheet you change it to has different column headings than the old Sheet, your merge tags could be affected. Here’s a YouTube video on editing the Sheet connected to a campaign.

Q: If I connect to a spreadsheet and then schedule a campaign, and then later on, I add email addresses to the spreadsheet before the campaign sends, will the new addresses be sent to?

A: No, for a regular non-repeating campaign, and yes, for a campaign that repeats daily. When you connect to the spreadsheet, GMass pulls the recipient list at that time, and for a non-repeating campaign, even if you schedule the campaign to send later, it will still only send to the recipients it initially pulled. However, the rest of the data, used for personalization, is pulled only at the time of sending. So, for example, if you connect to a spreadsheet with 10 rows of email addresses, and you schedule the campaign to send tomorrow, and then before tomorrow, you change the value of a FirstName cell from “John” to “Jon”, then Jon is the value that will be used for personalization.

But, if you add 2 more rows to the campaign before the campaign is sent, those 2 rows will still be ignored. However, if you use the recurring campaign feature with Google Sheets, the the two new rows will be sent to when the campaign runs next. A campaign connected to a Google Sheet that is set to repeat daily will pull the new addresses from the spreadsheet at the time of sending.

Q: Can I see analytics on how my campaign performed each time I edited it?

A: Yes. In the web-based report for your campaign, click Edit History to see a breakdown of how your campaign performed for each version.

Edit history of email campaign

Q: I accidentally deleted the Draft associated with my campaign. Can I still make changes?

If you deleted the Draft associated with a campaign, that accomplishes the same thing as canceling a campaign. Meaning, the campaign will cease sending emails. It will not, however, cease sending auto follow-up emails to anyone that has already received the campaign. Therefore, if you accidentally delete the Draft, you will no longer have a means to edit the campaigns auto follow-up settings, and auto follow-up emails may still go out. You can, however, restore a deleted Draft.

Q: I made changes to my campaign while it was sending. Will the new changes take effect immediately?

Yes, almost. If you edit a campaign while it is sending, GMass will notice that you’ve made a change. It will pause your campaign for a few seconds, pick up the new settings, and resume sending automatically. Note that a few emails may still send with the old settings after you’ve made your changes, but no more than 50 should send before the changes are picked up.

Q: My campaign is currently running, but I want it to stop and resume tomorrow afternoon. What do I do?

Just edit the date and time, and click SAVE CHANGES, and the campaign will stop shortly and resume sending on the date/time you entered.


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  1. Hello, I have been following the instructions above, to change the scheduled time for sending a remaining of a campaing. but it does not change.
    it is scheduled for 10PM and I need it to send the email to the remainding contacts in my list at 6AM instad.

    How can I change the sheduled time?

  2. I have been trying to add gmass to my chrome browser and is refusing to add. If try to install chrome extension is not installing what should i do ?

  3. Am I able to delete an email address if connected to a sheet and is already scheduled and have the campaign sent successfully?

      1. How do I send an additional attachment on a campaign that has already gone out? Mind you that I did not set up a follow up email so the campaign is not in GMass Scheduled folder.

  4. Sorry, am I able to delete an email address from the To field if already scheduled and connected to sheet. You mention the consequences when you add above.

  5. my gmass stopped working
    i paid for one year in january 2019

    my email address is


    please direct me to resolution or please refund balance of my one year payment

    thank you

    1. Hi Joyce,

      Please contact our support team at https://www.gmass.co/blog/how-to-get-support-from-the-gmass-team/ so we can address your concern directly.

    1. Hi Alex,

      If the campaign has already completed, the draft will no longer be editable (since it has completed), however, if the campaign has not finished sending, you can find your draft in the GMass Scheduled label.

  6. Scenario: My GMASS campaign starts at 11:00AM. At 11:15AM, after 3000 emails have been sent, I discover a link is not working. I pause the campaign, fix the link, and resume campaign. Is it possible to resend the email with the fixed link to the first 3000 clients?

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  8. Hi,
    I have scheduled birthday mailers via a Gmass campaign using CurrentDateIgnoreYear function. But to my surprise, say for eg. if anybody’s birthday was there yesterday, the same mailer is been sent today again to same mail id(to whom yesterday birthday wish was sent) along with some new ids(matching the criteria for today)
    I have selected “daily” to “all” settings.
    Shall i set “daily” to “new addresses”
    Please suggest.
    Its urgent.

  9. Is there a way to delete old messages from the drop down? When I go to select a custom message I want to use I have a lot of old messages I have to look through. Any way to select these un-used messages and remove them?

    1. Hi Shirley,

      To change the time to EST when scheduling simply add -5:00 to the scheduled EST timezone which is GMT-5

      1. NEED TO CHANGE SEND TIMES TO PST. How do I do this? And…. more importantly, how do I permanently change timezone to PST vs GMT which is now set as standard. Was PST when I first opened my account?

  10. I have a running campaign that is sending 500 emails a day to a list of roughly 170,000. I have discovered a way to eliminate roughly 35,000 of those 170,000 from my target audience. Is there any way for me to get a list of all of the email addresses to which my campaign has already been sent?

    I’d like to download it similarly to the way I can download my Bounce and Unsubscribe lists.

  11. I have just pressed “send” on a GMASS Scheduled campaign that sent partially yesterday and was to be completed today. It came back as “undelivered” although it was tied to a spreadsheet of contacts that worked for the first send.

    What happened here? Did it send? Why didn’t it send?

    1. Hi Lauren,

      If you’ve clicked on “Send” instead of the GMass button, no it did not send. This is because when a Google Sheet is connected, you most likely have a placeholder email that ends with @gmass.co in the TO field. These addresses are meant to be used in tandem with the red GMass button to pull your mailing list.

  12. Marvin,

    I briefly asked about this but didn’t get the answer I was hoping for:

    – If I want to change the “subject line” of my third email in the auto follow up sequence, can I just edit the subject line in the FIRST email (in the saved draft) and the auto follow ups will change the subject line??

    OR by editing the subject line and hitting GMass, will it send out the first email again to all those contacts?

    1. Hi Scott,

      You can change the follow-up’s subject line, however, only pending follow-ups with the criteria “ALL” and are sent as new emails will reflect the change in the subject line.

      No, editing the subject line and clicking the red GMass button will NOT resend the same email again to recipients who have already been sent that email.

  13. Hello Marvin,
    I was wondering if there’s any tips or guide for changing my email list that I’ve already made.
    I don’t know why but my email campaign sent recipients mixed with Campaign email list and Personal email list.
    Could you tell me how can I solve this problems?
    Thanks 🙂

  14. Please tell me as soon as possible how i can pause my campaign?

    I have an email list of 125 only 100 send the other emails bounced and said email limit reached. My account is now LOCKED because of this.

    I had 1 clickable link in my signature section of the email.

    GMASS keeps trying to send the remaining 25 emails that bounced so tell me before my account is banned how i pause this campaign ???

    And don’t tell me to email your support because I CANT SEND EMAILS

  15. Marvin my man, can you tell me how I would change custom follow up emails in an 8 email campaign? so right now its at stage 4, and stage 5, 6, and 7 are all custom email templates (where it says “send custom message above original” and you pull the drop down and choose a custom email you saved before). Do you know how I would alter some of the custom email templates that are in the auto follow up stagers 5, 6, and 7?

    1. Hi Ahsan,

      You would need to create a new email template then “GMass” it to your own email address. This will save it to that dropdown you’re referencing so you can select those new templates for Stage 5-7.

  16. my downloaded csv files and spreasheet files don’t have the same green colored icon any longer and won’t open. I removed extension to see if that would help. Lost here. Tons of contacts that I can’t seem to access any longer.

  17. Hello,

    I have paused a running campaign and want it to resume on a scheduled date and time later.

    Is it something that can be done?

  18. Is it possible to add follow up emails to a running campaign?

    I’ve done just that, but in the dashboard, it shows only the first follow up, not the additional ones I’ve added later.

  19. Hi,

    Any solution for incase of one attachment is missing – ( Sharing 4 attachments in one mail)

  20. Hi,

    Can I change the name of a campaign that has already been sent? No auto follow-up was requested in the original mailing.

    1. Hi Jeff,

      If you’re referencing the friendly name then yes. However, if you’re referencing the subject line of the original email, this change isn’t retroactive so you can change the subject line but the change will only apply to pending emails.

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