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Why would resubnetting a network cause problems sending mail

Hi Everyone, I chose to resubnet a network from 255.255.255.0 to 255.255.252.0 (have been using 192.168.0.1 - 192.168.0.254 as previous range, with internet router on 192.16.1.1 with a proxy in between) to increase the available IP's as we were running out.. I changed the static IP'd devices subnet to meet the new subnet and deleted the DHCP scope and created a new one to include the new subnet. Everything seemed to be working fine however one thing i found was not running after the changeover. No one is able to send e-mail (via pop3/smtp accounts, no exchange server) but we are able to receive mail?? Have i missed something obvious? could this be a result of the resubnet??

thanks in advance and as usual any help would be greatly appreciated.
Leon

Sudhirchauhan3

Did you try telnet serverip 25 for smtp and telnet serverip 110 for pop3 from the client .
see if you are able to make connections.

leont

ASKER

Hi Sudhirchauhan, one of the first things i tried. It connected sucessfully with no problems. I initially thought that is was a proxy issue so tried that to see if it was being blocked but i was able to connect ok?

leon

fm250

Leon,
Is that server (smtp and pop3) inside the network or outside your network.
if inside the network: make sure you have its ip address changed to the same scope -if it is static which I believe should be- if it is outside the network check the dns, try to ping the dns and the mail exhange mx record.

hope this helps!

ASKER CERTIFIED SOLUTION

Kevin Cross

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leont

ASKER

Many thanks mwvisa1, apologies for the delay in responding.