Switching from POP3 to SMTP

oriolrius lifestream » Switching from POP3 to SMTP - Javier's SBS Wonderland

oriolrius lifestream » Switching from POP3 to SMTP - Javier's SBS Wonderland — Mon, 02 Jul 2007 12:16:39 GMT

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Private versus Public DNS...

E-Bitz - SBS MVP the Official Blog of the SBS "Diva" — Mon, 06 Mar 2006 06:20:48 GMT

http://blogs.technet.com/canitpro/archive/2006/03/05/421256.aspx
Between the arguments over "IT", and...

re: Switching from POP3 to SMTP

Javier — Thu, 18 Aug 2005 03:01:00 GMT

Actually, this question is complicated because it depends on how your ISP handles this. Definitely leaving your POP3/IMAP provider as a backup mailserver is not the best option because for retreival you would need the POP3 connector.

Most ISP will just try to redeliver to the first MX record on a periodic basis. Others requires an ETRN command (which the SBS can do) to release the mail queue. These are the kind of backup mailservers you would prefer (I normally use ZoneEdit.com for such purpose, for only $12/yr).

re: Switching from POP3 to SMTP

Javier — Wed, 17 Aug 2005 20:03:00 GMT

Very interesting final question here :-)

What happens if the server goes down? Could someone please elaborate on this?

re: Switching from POP3 to SMTP

Javier — Wed, 22 Jun 2005 20:33:00 GMT

RE: Backup mailserver

I need a little clarification on this. Am I correct in assuming that if my webhost, who is currently offering POP3/IMAP4 e-mail for my domain, follows the steps outlined above, they will receive my domain's e-mail if and only if my SBS2k3 box cannot receive it? Also, how would I retrieve that e-mail in the case that the SBS2k3 box goes down...and/or is there a way to get all the e-mail that has accumulated to go back through the SBS2k3 box?

Thanks!

re:Switching from POP3 to SMTP

TrackBack — Thu, 19 May 2005 03:03:00 GMT

^_~,pretty good!csharpsseeoo

re:Switching from POP3 to SMTP

TrackBack — Fri, 15 Apr 2005 22:20:00 GMT

^_^,Pretty Good!

re: What's the best POP connector?

TrackBack — Sun, 10 Apr 2005 15:41:00 GMT

re: Switching from POP3 to SMTP

Javier — Wed, 16 Feb 2005 09:40:00 GMT

Thanks. This is a SBS2K3. The virtual SMTP server had the companies domain name but not prefixed by mail. as per the MX record. I have changed this and will get it tested.

re: Switching from POP3 to SMTP

Javier — Wed, 16 Feb 2005 02:32:00 GMT

This is most likely to happen on SBS2k than in SBS2k3. I believe the problem lies on the greeting that your server gives the other one. I suggest you test this by running Telnet x.x.x.x 25 (where x.x.x.x is your server). You should get a response from Exchange that has the Exchange version and the domain name. If you see a .local address there (or any non valid TLD) then this is certainly the problem. Another good way of testing this is on www.dnsreport.com.

The greeting should always match the MX record of your domain. To change it go to Exchange System Manager-> Servers-> %servername%-> Protocols-> SMTP-> Default Virtual SMTP Server-> Properties-> Delivery tab-> Advanced-> Fully Qualified Domain name: and change it to your real domain name exactly as it is on the MX record.

re: Switching from POP3 to SMTP

Javier — Wed, 16 Feb 2005 01:02:00 GMT

I have done this at a couple of sites. Mail comes in OK from most places. A couple of places though have said that the mail they send to these sites is rejected with the following message.
554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid
Is this something to do with the way the senders mail system checks our mail servers? Thanks. Marty

re: Switching from POP3 to SMTP

Javier — Mon, 13 Dec 2004 17:52:00 GMT

You may want to post this on a Newsgroup if you want more detailed help.

However, the sending issue might be an improper Smarthost configuration problem or maybe (if you are using DNS) your ISP is blocking smtp traffic. The receiving mail problem might be as simple as waiting for the records to propagate or it could be a misconfiguration on the settings. If you want, you can email the domain name and the IP of your SBS box to me and I could check it out for you.

re: Switching from POP3 to SMTP

Javier — Mon, 13 Dec 2004 17:30:00 GMT

I have a static ip and have asked my domain hosting service to set it up as directed above. I can also telnet in to my SBS03 server, but still cant receive or send email using the external domain suffixes. I have added these external email domain suffixes to my users accounts.