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Originally Posted by y@w  I'm connected to a mailserver that uses a CNAME with Zdesktop on Ubuntu 8.10..
If I'm not mistaken, the issue with having a CNAME pointing to a mail server is with MX records. |
The issue is with using a CNAME and incorrect set-up of DNS records.
Beware Using CNAME and MX at the Same Time Why You Shouldn’t Mix CNAME and MX How Best to Use a CNAME
While using a CNAME can work and it's use is rather ambiguous in the RFC, it's far better to avaoind it's use when pointing to a mail server.