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by navjun

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For some reason we can not send e-mail to domains outside our network (internet) but we can recive them from outside and even using the pop3 we can't send out , but we can send them to the internal addresses.
please help

thank you

8 replies

by navjun

when i try sending e-mail using the pop3 account to an outside server. i get this error:

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was mmm@hotmail.com'. Subject '', Account: myserver.org', Server: '192.168.254.2', Protocol: SMTP, Server Response: '550 5.7.1 Unable to relay for Navid_akham@hotmail.com', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

by mikeysykes

Do you have a Cisco firewall between you and the Net? If so, check the firewall to see if SMTP inspection enabled.

Try resolving this by disabling SMTP inspection on the firewall. Check that this has no affect on any security your company may want in place.

I suggest you try it, if it works you can work out what impact disabling this will have against your company's policies for the firewall.

by navjun

Thanks but nope,
I don't have a Cisco router or firewall , we just have a nat enabled ADSL modem withe the port 25 pointing to my e-mail server. and it did work before .. but now i have this problems.
and the problem persists even when i try sending pop3 from inside the network too... so this should be a smpt or pop3 problem

thanks again

by rkpillay

When you use the SMTP virtual server to send mail outside your domain, what happens to the mail? Does it stay in the queue?... do you get any error logs? If you want to send to the outside domains you need a DNS server to refer to... most probably your ISPs server. what I can assume is either your DNS is not able to resolve outside domains or if you're trying to relay through someother mail server (ISP mail server) then that server is blocking your server from doing that.

by thytrickster

You might want to check the 'MX' DNS records at your ISP. Along with what you have. I was fighting my Mail, until I added a MX record for myself. Mail works beautiful now. I say this because you are getting a "Relay" error.

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