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No MX record in DNS

I do not see an MX record listed in my forward look up zone.  Is it required?  Will adding one hurt anythong? For the most part, our email system (Exchange 2003) works fine.  We even have a printer that can send a scan to a computer by way of SMTP and that works fine.  However, we have an inbox account in Outlook 2003 that is setup as IMAP4/SMTP.  We can receive emails to this account but cannot send emails from it.  Would this even be related?  (Especially since the printer can send email by way of SMTP).  
Networking ProtocolsDNS

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8/22/2022 - Mon

If Exchange is working for external email you would have to have an MX record otherwise you would get loads of bounce backs.  

If you cannot send on the SMTP account it would be because it is configured wrong on the client.  
Might be an SSL setting incorrect SMTP server information or even login credentials for SMTP.
Bruno PACI

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Hello, PaciB.  Thank you for the helpful information.
I now understand that the MX record is on our domain host's servers.

I am not able to telnet to port 25 on the exchange server from the client; however, I am able to telnet from the Cisco switch.  I did try disabling our antivirus on the client and still could not telent the port.  Does this tell me that the switch is configured okay, but the client is not?

Also, I am not quite sure I understand when you said "After that, you'll have to check the client configuration. Verify that SMTP server IP address is well configured on the client."  Are you refering to how Outlook is configured on the client?

Thanks you CHutchins for your clarification.
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