sendmail and yahoo

leif_84 · 12-13-2007, 04:11 PM

Hi!
I'm running Slackware 10.2 with sendmail and popa3d. I setup relaying, so nobody can send mail from the outside to remote host, only from our LAN. I tested it with few email addresses, but anyone who had yahoo email account didn't receive my email. I never received failure delivery notification, so I'm not really sure what's the problem. According to log, there's no error or failure messages, only success on sending the mail.

Any suggestions?

gilead · 12-13-2007, 04:38 PM

Do you have a static IP address or a dynamic IP address? Yahoo may be one of the many places that doesn't accept email from dynamic IP addresses. If that's the case and you can relay through your ISP's SMTP server, use sendmail's SMART_HOST option.

EDIT: I'd have expected an error from them though, so that is odd...

ilikejam · 12-13-2007, 06:45 PM

Hi.

A lot of large email providers (hotmail, yahoo et al) will just black-hole email from hosts with: no SPF record, dynamic IPs, static IPs that are part of the ISP customer pool, no rDNS record.

No SMTP errors, no bounce, nothing.

Not much you can really do about it, other than using your ISP's SMTP relay as suggested by gilead.

Don't get me started on Verizon...

Dave

leif_84 · 12-14-2007, 05:01 AM

Thanks! Well, I have a static IP, my ISP is comcast. I will check whats up with the SPF and rDNS record