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Email Server Issues

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 MDS 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 MDS port forward IP

 

D. If using inbound hosted spam filtering provider, make sure to update new MDS 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 MDS 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 MDS IP location is connecting from

- If using relay, verify the relay server is on the MDS 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

.

.

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