True E-mail Limits

[JJDinsay]

Seem to get refused when using classic.asianet.co.th SMTP server when my e-mail is more than a certain amount. Never had this problem before. Any of you guys experiencing this. I send an e-mail about 250 words and I eventually get a connection refused on SMTP classic.asianet.co.th, but when I delete about 100 or so words, it works fine. Using Mozilla Thunderbird as the e-mail client. Any ideas?

[lopburi3]

I send multi meg emails with no problem using OE. Are you by any chance using an antivirus checking mail? Had a problem with KSC when I used Avest as it put on a header that KSC flagged as spam and rejected but often go through if you tried a second or third time.