I have a server running centos-release-7-2.1511.el7.centos.2.10.x86_64 with postfix version postfix-2.10.1-6.el7.x86_64 and dovecot version 2.2.10. I am also using roundcube for webmail. when a vacation filter (reply with message) is created in roundcube it adds a rule to managesieve.sieve in the user's mailbox. everything works fine except the reply comes from vm...@ns1.domain.tld instead of u...@domain.tld. ns1.domain.tld is the fully qualified name of the server.

it used to work fine on my old CentOS 6 server so I am not sure what has changed. Can anyone point me in the direction of where I can configure this behaviour?

I read somewhere it might have something to do with a line in master.cf
dovecot   unix  -       n       n       -       -       pipe
flags=DRhu user=vmail:mail argv=/usr/libexec/dovecot/deliver -d ${recipient}

i changed it to
flags=DRhu user=vmail:mail argv=/usr/libexec/dovecot/dovecot-lda -f ${sender} -d ${user}@${nexthop} -a ${original_recipient}

but it made no difference

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