why do you need virtaul domains in qpoper
mail works like this
you have a user joe
and your machine is setup to have lets say dns records for
mail.yourlastname.com mail.yourfirm.com mail.yourhobbie.org
if you setup sendmail by those 10 short points in sendmail's README
you will receive mail for
, firstname.lastname@example.org email@example.com
if you have another joe you wants to recevie seperate email for domain yourfirm.com, then you need to make new user say joe1 edit /etc/mail/virtusertable (prior you have to enable support for it when building sendmail.cf) and put line like
to check your mail through qpop it doesn't matter what domain you are using. You can tell your clients different domain names for each domain to be cooler isp, but no difference.
the only catch is if you set up pop3s (secure pop3 - port 995) there you can use only one host since you can only use one certificate. and for other you will get error message that the certificate doesn't belong to this host.
sendmail is indeed very straightforward ( if you have straightforward setup - if not it can get tricky)
qpopper is little more fun to tackle, but no big deal once you read the Install notes (which are there to be read
if any more troubles? just ask don't be shy