I've been using smtp port 25 and for telus.net mail and everything works fine from the telus network. When I switch to port 1025 so that I can send mail from outside the telus network all emails to gmail accounts go to the recipient's spam folder. Recipients on yahoo and telus seem to be working normally, it's just gmail that has this problem.
I've tried this from 2 different telus.net accounts sending to 4 different gmail accounts with the same results. The mail header has this which looks suspicious:
Received-SPF: none (google.com: firstname.lastname@example.org does not designate permitted sender hosts) client-ip=209.171.xx.xxx;
Hmmm..... I though it was due to attachments I was adding. A friend has not been receiving emails I send him, but I thought it was the type of file I sent in th attachment.
Hotmail is working normally as well.
This is happening to me as well, and is recent, as I previously could send to gmail addresses no problem.
I'll dig a bit more when he is free.