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ICT and Me

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Does anyone know how to send out mail from Connect on ports 465 and 587.
Reason: Port 25 is blocked by most ISP's in the Netherlands and we had to relay by ISP mailserver. Following problem occurs when using SPF check. ISP has many relay servers so our SPF txt becomes longer and longer.

Now I heard that our ISP block 25 but 465 and 587 are open (Secure lines) how to fix this in Connect. Connect may only send out to other mail servers on port 465 or/and 587.

Anyone Idea?

ICT and Me
Carlo Turk
The Netherlands
www.ictandme.nl
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Pavel Dobry (Kerio)

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The fix is very easy. Configure SMTP relay settings in Kerio Connect to use your ISP SMTP server and port 587 (with authentication).

Other servers in the Internet don't listen on ports 587 and 465 and don't accept messages there. So it cannot be used for email delivery. Only port 25 is designed for exchanging emails in the Internet.
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ICT and Me

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Hi Pavel,

That is now exactly not what I want. Because I relay already by the provider and SPF doesn't like it. For example emails to Vladimir or anyone at Kerio will not arrive because the relayserver of the provider aren't in my SPF rule. If I want too use SPF I need to add all relay servers of the provider. all 16 relays.

From the provider I heard that I must use 587/465 to send around the 25 block and relay servers. So that is why I asked.

ICT and Me
Carlo Turk
The Netherlands
www.ictandme.nl
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clan

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Email submission via ports 587 and 465 is designed for clients and always requires username/password. The owner of the smarthost is then responsible to setup SPF.
If you have a fixed IP address, it should be possible to get port 25 outgoing opened for your address. Have you asked your ISP about this?
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ICT and Me

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Thanks Christian for your answer but port 25 will not beeing opened by the ISP's. I have two different ISP's. Most ISP's in the Netherlands give dynamic IP who you have for very long period. But even when you have fixed IP it can be that ISP have the rule block port 25 and they won't change it.
But about the 587/465 ports I knew that already. Only ISP says it must work that way. I didn't believe the guy on the other side of the line, so I asked on the forum. Wink

Now I must find away to use SPF and keep ISP's as relay station. Sad
16 relays. Or make my own relay server somewhere Wink

ICT and Me
Carlo Turk
The Netherlands
www.ictandme.nl
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freakinvibe

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The blocking of port 25 is normally done for consumer grade, dynamic internet connections.

If you have a business internet connection with one of more fixed IP addresses, your ISP has to open port 25, otherwise you can't operate a mail server on that address. The only workaround would be to use a relay host. To sort out the SPF issue you can either delegate SPF to your ISP, or you can use IP ranges to avoid lots of single addresses in the SPF record.

But still, this is just a workaround. The best solution is to get Enterprise Internet access with port 25 open.

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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ICT and Me

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Hi Pascal,

Dutch lastname?
About the internet line I have business cable connection but not for enterprises. It is for SMB and one man companies like me. And the ISP will not open port 25. Arrange SPF by ISP isn't also possible, because all domains are managed by me. And ISP don't support this, already asked.

But I will use the relay for this moment untill I placed my Connect in datacenter.

ICT and Me
Carlo Turk
The Netherlands
www.ictandme.nl
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