I don't know where this question belongs but...
I have seamonkey on an xp computer that connects to the Internet via a hardwired dsl modem. I use the mail component of seamonkey as my default email client. It is an earlier version of Thunderbird.
I have Thunderbird 3 on my Windows 7 computer which connects to the Internet via a wireless connection to the hardwired dsl modem.
I can send and get email from both stations. But when I send myself a message from the XP computer to the Windows 7 computer, it gets lost.
I can send myself a message from the XP computer to the same XP computer simply by sending it and then closing the email client. Later it gets downloaded from the pop server. Or I can send it to another email address that is aliased to my personal email address.
But either way when I send a message to the Win 7 computer, it seems to send correctly but even if I never open the email client on the XP computer again but go straight to the Win 7 computer, the mail never arrives.
Any ideas what is going wrong here? Anyone? What am I missing?