Unsolved SMTP failure 550 - not able to send mails from Mail App

[manngobaum]

Hi,

I am unable to send mails from Apple Mail, iOS Mail or any other mail app than Roundcube.

Diagnostic-Code: smtp; 550 Mail from domain 'xxx.de' is not allowed from your host

What can I do? I searched for solutions and found a couple of information about it but no real solution.

Best,
Sven

[girish]

@manngobaum how have you configured iOS mail and apple mail? You have to use port 587 (STARTTLS) to send mails.

[manngobaum]

@girish These are my settings:

[subven]

@manngobaum the Cloudron email server (the part that goes to "Host name") is at my.xxx.de IF you did not move it by hand. You can check this in the Cloudron settings ---> Email --> "Mail server location".

[girish]

@manngobaum you can try unchecking 'Use TLS/SSL'. Port 587 is the so called "opportunistic TLS" (STARTTLS) and each UI means different things when they say "Use TLS".

You can also try port 465 with the TLS box checked. See https://docs.cloudron.io/email/#inbound-ports