This is a connection from google:

Dec 15 19:57:56 kahlo postfix/smtpd[11144]: connect from 
mail-gw0-f44.google.com[74.125.83.44] 
Dec 15 19:57:56 kahlo postfix/smtpd[11144]: NOQUEUE: reject: RCPT from 
mail-gw0-f44.google.com[74.125.83.44]: 550 5.1.1 <rainexpec...@theo.to>: 
Recipient address rejected: User unknown in local recipient table; 
from=<rainexpected+caf_=rainexpected=theo...@gmail.com> 
to=<rainexpec...@theo.to> proto=ESMTP helo=<mail-gw0-f44.google.com>
Dec 15 19:57:56 kahlo postfix/smtpd[11144]: disconnect from 
mail-gw0-f44.google.com[74.125.83.44] 

The domain theo.to is listed in mydestination, but the name
"rainexpected" is not found in /etc/passwd or in /etc/aliases.

This is a connection from comcast:

Dec 15 19:58:28 kahlo postfix/smtpd[11144]: connect from 
c-68-48-70-58.hsd1.dc.comcast.net[68.48.70.58] 
Dec 15 19:58:29 kahlo postfix/smtpd[11144]: NOQUEUE: reject: RCPT from 
c-68-48-70-58.hsd1.dc.comcast.net[68.48.70.58]: 550 5.1.1 
<rainexpec...@theo.to>: Recipient address rejected: User unknown in local 
recipient table; from=<rainexpec...@theo.to> to=<rainexpec...@theo.to> 
proto=ESMTP helo=<okeefe.theo.to> 
Dec 15 19:58:33 kahlo postfix/smtpd[11144]: lost connection after RCPT from 
c-68-48-70-58.hsd1.dc.comcast.net[68.48.70.58] 
Dec 15 19:58:33 kahlo postfix/smtpd[11144]: disconnect from 
c-68-48-70-58.hsd1.dc.comcast.net[68.48.70.58]

Again, the domain theo.to is listed in mydestination, but the name
"rainexpected" is not found in /etc/passwd or in /etc/aliases.

You also have a configuration error:

Dec 15 19:57:51 kahlo postfix/trivial-rewrite[11148]: warning: do not list 
domain theo.to in BOTH mydestination and virtual_mailbox_domains

Fix that. If you have the users in virtual_mailbox_maps, then don't
list the domain in mydestination.

        Wietse
        Wietse

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