Mail delivery failed: returning message to sender

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June 12, 2021, 04:37 AM
Jenő Kocsi

Mail delivery failed: returning message to sender

If I send an html message it will come back with this error.
If, on the other hand, I send it as a plain text message, the recipient will receive it.
What could be the problem?

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

****wap@freemail.hu
host fmx.freemail.hu [84.2.43.65]
SMTP error from remote mail server after end of data:
550 5.7.1 Message denied by policy
June 12, 2021, 05:01 AM
Joe Can
Here is some information on the "550 5.7.1 Message denied by policy "error code:

- Solved: Exchange SMTP Error 550 5.7.1 Unable To Relay
https://www.stellarinfo.com/article/...e-to-relay.php

- Fix email delivery issues for error code 550 5.7.1 in Exchange Online
https://docs.microsoft.com/en-us/exc...xchange-online

I wonder how are you sending your emails:
- Are you sending them straight through your hosting account?
- Are you using a special email service?
June 12, 2021, 05:17 AM
Jenő Kocsi

Yes, I send it through the hosting account.
I only have this error when I send an html message like an account registration confirmation email. If I send it as plain text it is good.
June 12, 2021, 07:48 AM
Joe Can

I will send the same and test.
All my email templates are Html

Edit: I just tested my registration email and it worked fine.
June 12, 2021, 08:16 AM
Jenő Kocsi

It works well for me too, but it doesn't work for two email providers in Hungary. I can’t talk to them because they don’t reply to a letter.
June 12, 2021, 08:35 AM
Jenő Kocsi

Looks like something is wrong with the letter format. The letter format is incorrect. This is why the letter sent comes back. These providers use some sort of filter that monitors the mail format. But I don't know what can't be good about it.
June 12, 2021, 08:56 AM
Jenő Kocsi

Solved.

html_email_source.html file had to be fixed and so is now good.
I wrote the following:

<!DOCTYPE html>
<html lang="hu">
<title></title> instead <title>I gave him an address</title>
June 12, 2021, 09:35 AM
Joe Can

Glad to see it was fixed.