521 5.3.0 Upstream error

Feedback Previews & Betas
#1

Hello Cloudflare-Community,
i have a problem with Cloudflare E-Mail (Beta).
i have the same Error: Email routing giving "521 5.3.0 Upstream error"

Another domains working without any problems.

All another Domains: Any E-Mail Account/Provider —to—> Any [email protected] —forward—> [email protected] = Working/Received

example.io : Any E-Mail Account —to—> Any [email protected] —forward—> [email protected] = not working/not receiving

BUT if i change [email protected] to [email protected] or [email protected], it’s working

example.io : Any E-Mail Account —to—> Any [email protected] —forward—> [email protected]/ [email protected] = Working/Received

Only one domain is not working with a specific adress [email protected]

Any idea, why this domain with the same settings/szenario and address is not working?
I can send my domain via PM, if u want.

SMTP error from remote server for TEXT command, host: amir.mx.cloudflare.net (162.159.205.12) reason: 521 5.3.0 Upstream error. fr3pl98HNKBx

Thank you
Pedi

#2

Can someone help me?

#3

Hi Anyone,
Did you get any solution for this error?
Since I am getting same error with one of my domain.
Please help me out if anyone of you have any solution for this.

#4

Hi morekula154,
i feel with you and im so sad you have the same problem.
I give up, i tried so many things, and last month i give up. Moved some domains away from Cloudflare i found no solution and nobody helped (Support/Community).
If you find with your luck a fix for this bug, please please please tell me :slight_smile:
I wish you much success on this rocky path.
Pedi

#5

I also not able to find anything yet…
I tried by contacting Cloudflare support also. But they are also not able to find the exact solution.
Yes definitely I will share if I found anything.
Meanwhile can you please let me know if you have any good alternative of Cloudflare or any mail forwarding application which works with any error

#6

For free?
If yes:
Not rly, idk any good choose.
For mail forwarding (receive ->forward) Mybe something like : Private geschäftliche E-Mail - Kostenlose professionelle E-Mail | Forward Email or Private geschäftliche E-Mail - Kostenlose professionelle E-Mail | Forward Email

For sending (SendGrid , MailJet , https://de.sendinblue.com/ )

#7

Hi,
any updates?

greets