Mail appears to send, but really isn't.

This is a bizarre problem. I have two partitions (well, hard drives), but which have their own installation of Tiger. I have been using one partition for a while, have my mail set up (a .mac account and several POP accounts). Things work fine.
Then I boot into this other partition and also set up mail there. (Don't ask me why I do this, it's rather convoluted!) I have been sending and receiving mail and everything appears to be fine. But then people have started to complain that I'm not answering their emails, and it turns out that nope—nothing is going through. Sending mail works fine on the other partition (the one I've been using longer) but not on this one.
I reinstalled Tiger on this second partition (for a variety of reasons) and figure that this would fix the email problem. But nope—it's still doing the same thing. It appears to send the mail (makes the "whoosh" sound like it's sent it, appears in the "sent" folder), but nothing happens.
Oh, and another thing—my .mac account is unaffected. It can send out email fine.
Please help! I don't understand this! I guess I can always boot into that other partition to send out email, but obviously that's not my first choice.
I'm using Comcast Cable and am using the outgoing SMTP address of "smtp.comcast.net" (like I have been for years). I even tried putting in my Comcast username and password and authenticating, but that hasn't made any difference. I will probably call Comcast tomorrow to see what they say. I am stumped!
Mini 1.66 GHz/1 GB/1.5 TB total HDD space, FCS 1   Mac OS X (10.4.9)   Aging G4 Digital Audio, 1 GB, 120GB, iPod Nano

This is very curious! You need to investigate what, if any differences, there would be in the messages being sent? Look for differences in use of Rich Text Format vs Plain Text, where attachments are involved. Anything different about the composition of the messages is a possible rationale for the recipient's mail server and SPAM filter to be blocking the messages you have sent, rather than anything on your end of things. If messages leave the Outbox, and are stored in the Sent mailbox they were sent by the SMTP.
More info, please.
Ernie

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