Problem while answering email via iPhone7

[federico.ballarini]

Probably your first domain is firma.lan… if you can’t set identity on iPhone you can try to use this workaround (check to these posts):

Undelivered Mail Returned to Sender with .local domain

I’ve changed the solution mark to the post containing the most correct answer, so others can find the solution faster.

Modify sender domain address in Postfix

Good! I think that it’s not necessary to implement this configuration… with one line and two command you’ve solve the problem. Please mark the answer as solution: it can be helpful for any other person.

Regards.