[Dovecot] ampersand in local-part

[Bradley Giesbrecht]

I have a new email server (postfix/dovecot/mysql) with accounts  
migrated from another server (different platform) and email addresses  
with ampersands like "r&d at domain.com" that worked on my old email  
server are not working now.

I'd like some help tracking this issue down.

Can anyone tell me if this looks like a postfix, dovecot or mysql issue?

Some log info follows. For brevity I'm just posting this log snip as  
I'm thinking I will get a simple answer to this but I will be happy to  
post postfix, dovecot or mysql settings in detail if they are required.


Thank you, Brad

dovecot.log file:
[...]
dovecot: Mar 27 16:37:23 Info: auth(default): auth(?,216.111.149.248):  
Invalid username: r&d at domain.com
dovecot: Mar 27 16:37:23 Info: auth(default): cram-md5(?, 
216.111.149.248): Username contains disallowed character: 0x26
dovecot: Mar 27 16:37:24 Info: auth(default): new auth connection:  
pid=68420
dovecot: Mar 27 16:37:25 Info: auth(default): client out: FAIL  1
dovecot: Mar 27 16:37:25 Info: auth(default): client in: AUTH   2 [....]
dovecot: Mar 27 16:37:25 Info: auth(default): auth(?,216.111.149.248):  
Invalid username: r&d at domain.com
dovecot: Mar 27 16:37:25 Info: auth(default): plain(?, 
216.111.149.248): Username contains disallowed character: 0x26
dovecot: Mar 27 16:37:27 Info: auth(default): client out: FAIL  2
dovecot: Mar 27 16:37:27 Info: imap-login: Disconnected (auth failed,  
2 attempts): method=PLAIN, rip=216.111.149.248, lip=216.111.149.248,  
secured
[...]