SMTP question

[DigitelD]

Is it possible for a hosted email service to only use POP3 and not SMTP? We are trying to implement a solution that will work with a customer's email account and the company that is hosting their email said they are not using SMTP at all. I didn't know that could be done.

Thanks

SHK Certified (School of Hard Knocks)
NCSS

 

[58sniper]

No.
POP3 is only for retrieval of email. SMTP is for sending of email.

Pat Richard MVP
Plan for performance, and capacity takes care of itself. Plan for capacity, and suffer poor performance.

http://www.ucblogs.net/blogs/exchange/

 

[DigitelD]

I researched it and that is what I found. The funny thing is I heard the tech from the hosting company say that they did not use SMTP at all.

SHK Certified (School of Hard Knocks)
NCSS

 

[58sniper]

They may not. Many of your "fly-by-night" operations don't maintain their own SMTP servers - they tell you to use your ISPs.

Pat Richard MVP
Plan for performance, and capacity takes care of itself. Plan for capacity, and suffer poor performance.

http://www.ucblogs.net/blogs/exchange/

 

[VinceWhirlwind]

If you receive an email from them, you can look at the headers (right-click on the email in Outlook and select "properties").
In there you will see every IP address in the chain of transmission.
Then you can use whois to tell you what IP addresses belong to whom.

Also, you can go to a command-line and type in
nslookup
set ty=mx
and then put in their domain name and it should show you the relevant SMTP servers.