SMTP Error: No support for Delivery Status Notifications

[ANGDIC]

How I can solve this problem?

thank you

[Julius Caesar]

Which version of Roundcube are you using?

[ANGDIC]

I'm using 0.5.1

[Julius Caesar]

Does your smtp-server support it:

Code Select Expand

telnet <server> 25
EHLO domain.com
A response can be like this:

Code Select Expand

EHLO domain.com
250-mail.domain.ext Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-EXPN
250-VERB
250-8BITMIME
250-SIZE 10000000
[B][COLOR=Red]250-DSN[/COLOR][/B]
250-AUTH LOGIN PLAIN
250-STARTTLS
250-DELIVERBY
250 HELP

[ANGDIC]

EHLO PROGESI.IT
250-smtpoutgw2.mclink.it
250-8BITMIME
250-SIZE 104857600
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250 STARTTLS

[Julius Caesar]

It looks like your smtp-server does not support DSN.

[aldomiri]

Solution :
You can un-check the option in Roundcube >> Settings >> Composing Message >>
"Always request a delivery status notification".