Hi,
The answer is 'it depends'. If you are using individual pop accounts, then yes, bcc works as normal.
If you are using a catchall account, then the answer is 'maybe'.
To test, bcc a message to an email account you can check (not the same as who it's to or from). Then in the headers, many mail servers will put:
for username@domain.com
in the Received lines, or:
Delivered-To: username@domain.com
in the headers. Gossamer Mail will look in there for that information. If your mail server doesn't do this, then no, you won't be able to get BCC's.
We are planning on offering Gossamer Mail + qmail installed optimally (i.e. for large number of pop boxes) as an integrated package. This will be available end of this week, and will be priced around $1200 US including Gossamer Mail license (qmail is free software, you are paying for us to setup+integrate on your server - not a trivial task). This is only suitable for people who run dedicated servers though.
Hope that helps,
Alex
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Gossamer Threads Inc.