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I'm trying to send email from my home mail server. It works fine for incoming email, but any time I try to send I get rejection messages from some recipients. What's going on?
Answer by Cry Havok · Jan 05, 2010 at 08:19 PM
If you were having problems with sending to all recipients it would suggest that your ISP was blocking the email port (25/TCP). That you can send to some but not all suggests your problem is simple - you're trying to send directly.
Few providers these days will accept email directly from a dynamic IP address. To send email you either have to be on a static IP address (and some providers static IP ranges are just subsets of their dynamic allocation and so are still treated as if they're dynamic) or relay your email through a mail server. Your options there are to use your ISP's mail server or a service like SendLabs SMTP.
Answer by gmojo02 · Jul 24, 2011 at 04:08 AM
Port 25 is open with my ISP and I am able to send some mail but others reject due to dynamic IP address. I am using this http://www.dyndns.com/services/sendlabs/outbound.html as recommended above and still having reverse lookup issues as my dynamic ip is still listed in the header. Am I missing something as I was under the understanding the smart host listed above took care of this. Thanx gm
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