Sending mail to a list does not work if the name contains the character ":"

If you create a list of addresses by inserting the character ":" in the name of the list, when you send the mail to the list, the messages are not sent to the individual recipients but to the name of the list and a bounce is received.

Steps to reproduce:

• create a list with this name: "list: test"
• send an email to the list

Expected behaviour:

• the email is sent to the individual contacts included in the list

Actual behaviour:

• the email is not sent to individual contacts but to the name of the list, for example:

postfix/smtp[10492]: 9A224453D57: to=<list-1962839@com.sonicle.webtop.contacts>, relay=none, delay=0.25, delays=0.23/0.02/0/0, dsn=5.4.4, status=
bounced (Host or domain name not found. Name service error for name=com.sonicle.webtop.contacts type=AAAA: Host not found)