If the recipient's contact contains the text between " " in the name, the SMTP server refuses to send it because an incomplete recipient is passed.
Steps to reproduce:
- create a contact with this name AAA "B.CCC" DDD and this email <email@example.com>
- send an email to this contact
- the email is sent to the email address <firstname.lastname@example.org>
- the mail is rejected by the SMTP server and returning this error:
554 Unable to deliver message
In the mail server log:
In the webtop log:
By performing the same sending with Roundcube the problem is not present.