Send mails from alias using alias' SMTP in Google Script

Question

I have a Google script that sends mails given some data in a Spreadsheet. The mail is sent with GmailApp using an alias set on Gmail settings. This alias is a PEC, the italian "certified mail account".

This is the function that sends the mail

var aliases = GmailApp.getAliases()
var fileXML = DriveApp.getFileById(xmlId);

var subject = fileXML.getName().slice(0, fileXML.getName().length - 4);

GmailApp.sendEmail
(
  toMailPECAddress,
  subject,
  '',
  {
    // Send from alias (PEC account)
    // Alias must be configured via GMail settings
    'from': aliases[0],
    'attachments': [fileXML]
  }
);

This always worked. Since a couple of weeks ago, when I started getting a "service unavailable: gmail" error.

So far I did these test:

re-generate the alias, to be sure that it is "verified"
check that I can send mail from alias from Gmail web page; the receiver gets a mail that is correctly sent from the alias' SMTP
send a mail via script with the exact same code but from my main Gmail account; no errors with that
use MailApp instead of GmailApp in script; the mail is sent without errors, but it is NOT sent from the alias SMTP

What can be the problem?

Is there any new limitation that doesn't allow to send mails from aliases, or from non standard SMTP (from a PEC in my case)?

Jats PPG · Accepted Answer · 2025-05-14 22:25:38Z

2

There seems to be an issue on Google's end that's causing the error since removing the attachment from the code sends the email. What I recommend is to submit a bug report about it and for the meantime, I've noticed that if you add something on the body, the code works.

From:

var aliases = GmailApp.getAliases()
var fileXML = DriveApp.getFileById(xmlId);

var subject = fileXML.getName().slice(0, fileXML.getName().length - 4);

GmailApp.sendEmail
(
  toMailPECAddress,
  subject,
  '',
  {
    // Send from alias (PEC account)
    // Alias must be configured via GMail settings
    'from': aliases[0],
    'attachments': [fileXML]
  }
);

To:

var aliases = GmailApp.getAliases()
var fileXML = DriveApp.getFileById(xmlId);

var subject = fileXML.getName().slice(0, fileXML.getName().length - 4);

GmailApp.sendEmail
(
  toMailPECAddress,
  subject,
  ' ', // Add a blank space or any character
  {
    // Send from alias (PEC account)
    // Alias must be configured via GMail settings
    'from': aliases[0],
    'attachments': [fileXML]
  }
);

answered May 14 at 22:25

Jats PPG

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3 Comments

il_mix May 15 at 15:57

Didn't try to add a body. Will test and report. It will be more than enough for me if it works. On the other side, I can't remove the attachment (dind't test either)

Jats PPG May 15 at 18:05

Just add a blank space in the body just like my sample above.

il_mix May 17 at 11:58

I tested the blank space in the mail body and it actually worked! Thanks for the super-easy hint!

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