Problem with Gmail “Send an Email” module — duplicated text and boundary showing

David_Laniel · October 24, 2025, 9:18am

Hi everyone,

I’m building an automation that analyzes, prepares, and sends emails. Everything works fine except when sending:
The recipient always receives the email twice in the same message — first the normal text, and then again followed by technical data like:

--boundary_1761236498
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: 7bit

If I try to send the message in HTML mode, it gets even worse — the email client doesn’t recognize it as HTML and shows the raw tags.

Has anyone faced this issue before with the Gmail “Send an email” module (or with HTTP requests to Gmail API)?
What’s the right way to format the body (plain text vs. HTML) to avoid this “boundary” issue?

Thanks in advance!

Stoyan_Vatov · October 24, 2025, 9:19am

Hey David,

can you share some screenshots from the scenario and what you are sending?

David_Laniel · October 24, 2025, 11:07am

Hey Stoyan, here it is

David_Laniel · October 24, 2025, 11:10am

With all my gmail data coming from my data store

in which I stored all I need

samliew · October 26, 2025, 4:20pm

Welcome to the Make community!

In the latest (v4) Gmail Send Email module, there are two body types you can select.

Raw:

Screenshot 2025-10-27 001704528×210 15.7 KB

Collection:

Screenshot 2025-10-27 001801582×462 28.6 KB

If you select “Collection” (of contents), you need to map the content as an ARRAY of contents, not a single TEXT variable.

If you do not have an array of content collections, you have to either:

Add a sub-item “Content 1”, and add your content into the “Text” field, or
Use the “Raw HTML” Body type.

See above screenshots for examples.

Hope this helps! If you are still having trouble, please provide more details.

— @samliew
_{P.S.: investing some effort into the tutorials in the Make Academy will save you lots of time and frustration using Make!}

David_Laniel · October 27, 2025, 3:00pm

Hi there, I keep trying every solution but the result is the same even with the 2 options you mentioned.

Last one I tried is:

And the result is:

I also tried with hard text but result is also the same.

Any other idea on what could occur?

David_Laniel · October 27, 2025, 3:30pm

I just noticed an additional information.
The above display is when I open the mail through Outlook, but when I open it through gmail, the display is as follows:

How can I make sure it to make it correct for any email solution/provider?

samliew · October 30, 2025, 4:33am

Based on what I can see, this is a BUG with the module itself.

The boundary is not complete, as it is missing -- at the end.

--boundary_1761236498

For more information, see Why is email displaying mime boundary in body

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