# Reply by eMail SMTP authentication
**URL:** https://meta.discourse.org/t/reply-by-email-smtp-authentication/205245
**Category:** Self-hosting
**Created:** [October 5, 2021, 10:08am UTC](https://meta.discourse.org/t/reply-by-email-smtp-authentication/205245 "2021-10-05T10:08:18Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Kai\_Kretschmann](https://meta.discourse.org/u/Kai_Kretschmann)
#### Post date: [October 5, 2021, 10:08am UTC](https://meta.discourse.org/t/reply-by-email-smtp-authentication/205245/1 "2021-10-05T10:08:18Z")
I just did a fresh normal docker based setup and everything works so far.
I also added all those SMTP settings for sending out eMails like registration, or summary for a user.
Let’s name that account “ **talk** ”
If I now want to add the feature “Reply by eMail” I therefore added a second mail account on my personal MailU instance with POP3 enabled.
Let’s name that account “ **repl** ”
But: Now it seems the normal eMails also get “ **repl** ” as the sending address but use the smtp auth settings from user “ **talk** ”. And now my Mailserver denies that with some error 5xx for sure.
I did not find enough hints when is which address used and how would the “ **repl** ” account get any sending auth settings? I only found the POP3 setup stuff yet.
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### Author:  [@Kai\_Kretschmann](https://meta.discourse.org/u/Kai_Kretschmann)
#### Post date: [October 5, 2021, 10:48am UTC](https://meta.discourse.org/t/reply-by-email-smtp-authentication/205245/2 "2021-10-05T10:48:23Z")
Until now it seems only to work if both addresses are the same account, but additional aliases.
I added one catch all **reply+\_%@mydomain** which is the preferred syntax from mailu.