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6/24/10
Original Poster
jmoreno

SMTP Protocol Returned a Permanent Error 550 client.

Domain Name:ISSPR.COM to KRANSLAW.COM
Issue Description:
We have a Domino server (8.5) at ISSPR.COM and whenever we send an email
ISSPR.com from KRANSLAW.COM we get the following DELIVERY FAILURE message:
 
Your Message: <Subject> was not delivered to: <address>@kranslaw.com
because: Error transferring to KRANSLAW.COM; SMTP Protocol Returned a Permanent Error 550 client.
 
Now I've tried several times and we keep getting the same error.
I also tried from Gmail and Yahoo and I didn't get any errors back...
 
I checked both MX records on MXToolbox and both apear to be fine.
 
Any ideas?2010-06-23
 
I just got confirmation that the email was received from the Gmail account.
 
So there must some sort of special consideration that we must take in our mail server in order for our emails to reach KRANSLAW.COM
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All Replies (5)
Google user
6/25/10
Google user
Hi

This error is happening because you have installed the Microsoft IIS SMTP Service, and your email client is talking to that service rather than to VPOP3.

To resolve this, you need to close down the Microsoft SMTP service and restart VPOP3.

    * Go to Start -> Control Panel -> Administrative Tools -> Services in Windows.
    * Find the Simple Mail Transfer Protocol service (sometimes called the Microsoft Simple Mail Transfer Protocol or Microsoft SMTP Service etc)
    * Double-click on this service to get the settings
    * Press the \'Stop\' button to stop the service
    * Set the Startup Type to Disabled.
    * Find the VPOP3 Email Server service
    * Right-click it and choose Restart


Regards,
Imran Khan
Email: sup...@dhruvsoft.com
Web: www.dhruvsoft.com
6/25/10
Original Poster
jmoreno
Hi DhruvsoftGA thanks for your help.
 
I'm sorry if I didn't give enough information.
 
ISSPR.COM
 
SMTP Server:
- Domino 8.5
- Linux SuSE
- In DMZ
 
Primary Mail Server:
- Domino
- Windows Server
- Internal
 
KRANSLAW.COM
MX is ASPMX.L.GOOGLE.com
 
When our SMTP in ISSPR.COM talks to KRANSLAW.COM in (MX is ASPMX.L.GOOGLE.com)
 
We get the error above (Error transferring to KRANSLAW.COM; SMTP Protocol Returned a Permanent Error 550 client)
 
So if I understood you correctly you think that our SMTP Server is running on windows but it's actually in Linux.
Also if we had the problem that your mentioning I think that we might not even be able to send email to other domains, but KRANSLAW is the only one that's currently giving us problems. Just to be sure I checked in our primary mail server and
this server doesn't even have the simple mail transfer protocol service, and we don't have the POP3 port enabled.
6/28/10
Original Poster
jmoreno
Hi I'm not 100% sure if this was the right forum to ask my question. I decided to post it in the
same forum as one of the suggestions.
 
Apparently whenever I try to send an email to a Google Apps Domain I get the following error:
Error transferring to KRANSLAW.COM; SMTP Protocol Returned a Permanent Error 550 client
 
But I can send emails to other domains even Gmail.
 
Maybe there're some sort of extra security considerations that are taken into account whenever
emailing a google apps account, so maybe there's something that I must do on my end...
 
Any help will me much appreciated.
 
Thank you
6/28/10
Original Poster
jmoreno
Important update
 
KRANSLAW.COM has no SPF record, but we ISSPR.COM have v=spf1 mx -all.
 
Could the fact that they don't have an SPF record be what's causing the SMTP problems?
Firefly360
1/22/11
Firefly360
I have user who try send to a particular external email , SMTP Protocol Returned a Permanent Error 550 MI:SPF
not sure what was the issue, as I try sending via yahoo, or goggle mail is fine no error, user keep insist it our Domino server issue
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