INTERNALLY HOSTED MAIL SERVER
Setup: Site has email server in-house.
INBOUND Email Issues
A. Make sure port forwarding is correct
B. From public client *Not behind the subscription in question*
=> Test port forward is working using telnet
Telnet to mail server OBR Public IP on port 25 (Or as mail server is configured)
"Telnet 1.2.3.4 25"
Ehlo
Mail from:
Rcpt to:
Data
.
.
C. Make sure MX records were update for domain to send to new OBR port forward IP
D. If using inbound hosted spam filtering provider, make sure to update new OBR port forward IP with spam filtering vendor.
OUTBOUND Email Issues
A. Verify server is able to browse internet okay (Can check for live connections from source IP to internet destinations
B. Make sure server is not using ISP DNS servers
C. If they use outbound Spam filtering, make sure OBR public IP the server is connecting from is allowed to send email thru the proxy server at spam filtering provider
EXTERNALLY HOSTED MAIL SERVER
- Have mail server hosting provider whitelist OBR IP location is connecting from
- If using relay, verify the relay server is on the OBR network and communicating outbound okay
- Make sure relay server is not using ISP DNS servers
- Make sure mail server host name is resolving correctly
=> Test port forward is working using telnet
Telnet to mail server first by IP and then by Hostname on port 25 (Or whatever port mail server is configured to receive on)
"Telnet 1.2.3.4 25"
Ehlo
Mail from:
Rcpt to:
Data
.
.