* an...@ursc.gov.in <an...@ursc.gov.in> [191031 09:00]: > > > We have migrated to a new domain yyy.com. We also continue to receive > > > mails on old domain xxx.com. > > > > > > When a sender sends a mail to a...@xxx.com (old domain), mail is > > > received and delivered to user abcd. Abcd when he replies to all (his > > > from email address will be a...@yyy.com [new domain], and hence, mail > > > is also sent to a...@xxx.com [old domain]. So, the sent mail is also > > > received back to the same sender. > > > > > > When the actual recipient receives the mail, he will have a...@xxx.com > > > and a...@yyy.com in the address list. So, when he replies to that > > > mail, 2 mails will be sent to the same user. > > > > > > What's the best way that, the user receives only one mail, when both > > > domains are in To addresses? > > Sorry for the trouble. But, after doing that, when I sent a mail from > outside to both these email addresses abcd@old.example and > abcd@new.example (in a single mail) , 2 emails came instead of one. I > want that, if both these domains are listed in the same mail, only one > mail should be received.
The problem here is not Postfix, it is the mail user agent and the (carbon-based) mail user. Users of yyy.com, when replying to mail that was sent to their xxx.com address, must ensure that the reply does not include their old xxx.com address in the From, To, or CC list. For those few who still use a command-line mail client, mutt (and neomutt) can handle this for them, when properly configured. I have no clue how to get other MUAs, such as Thunderbird, or (ugh!) Gmail, to do that automatically, or if they even can. In the absence of a MUA that is not, or cannot be, configured to do it automatically, it is the user's responsibility to adjust the recipient lists appropriately. ...Marvin
