Comments on: SMTP on PORT 587. You should know this. http://mostlygeek.com/tech/smtp-on-port-587/?utm_source=rss&utm_medium=rss&utm_campaign=rss Smothered in Awesome Sauce! Tue, 03 Jan 2012 06:09:19 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: typhus http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-26542 typhus Fri, 28 Oct 2011 01:25:01 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-26542 ...or you could just not send email over public wifi -just sayin tho you could always bypass whichever port or create a remote vpn. Great post btw …or you could just not send email over public wifi -just sayin tho you could always bypass whichever port or create a remote vpn.

Great post btw

]]> By: Charlie Giannakos http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-26518 Charlie Giannakos Thu, 20 Oct 2011 14:30:17 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-26518 How do i change from Port 25 to Port 587. How do i change from Port 25 to Port 587.

]]> By: TIM http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-26455 TIM Mon, 03 Oct 2011 11:54:43 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-26455 HOW DO YOU DELETE THE ERROR MESSAGE THAT CONTINUES TO COME UP. THE SYSTEM SEEMS TO WORK OK HOW DO YOU DELETE THE ERROR MESSAGE THAT CONTINUES TO COME UP. THE SYSTEM SEEMS TO WORK OK

]]> By: King Ezhil http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-26350 King Ezhil Fri, 02 Sep 2011 13:56:34 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-26350 Oh yeah ! Thk q so much duet... port 587 for submitting-mail server…works great...!!!!!!!!!!! Oh yeah ! Thk q so much duet… port 587 for submitting-mail server…works great…!!!!!!!!!!!

]]> By: Ben http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-26189 Ben Mon, 01 Aug 2011 02:46:06 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-26189 In short: For incoming mail, try setting to POP3, mail.comcast.net, port 995. For outgoing mail, try setting to SMTP, smtp.comcast.net, port 587. Check require encryption / SSL / TLS / etc for both. Require authentication checkboxes may be necessary. Explanation: Incoming mail server appears to be mail.comcast.net. It does not seem to have the IMAP4 or IMAPS (IMAP4 over SSL) open (TCP 143 and 993, respectively). It does seem to have both POP3 and POP3S (POP3 over SSL) open (TCP 110 and 995, respectively). This can be found with a series of DNS lookups and telnet tests. It appears the outgiong mail server is going to be smtp.comcast.net and port 587 (SMTP submission, which supports starttls for SSL) is open. I connected and from a EHLO can see it supports STARTTLS. Port 25 is also open. The comcast.net relays as per MX records have port 25 open but are only MTA's designed, it seems, to relay mail from other mail servers with proper reverse DNS lookups so as to prevent anybody relaying through them from home, starbucks, etc. Ports list: incoming mail maildrop-style, no encryption: POP3 - port 110 IMAP - port 143 incoming mail maildrop-style, with encryption: IMAP4 over SSL (IMAPS) - port 993 Secure POP3 (SSL-POP) - port 995 outgoing transfer / relay: SMTP - port 25 outgoing "submission" (potentially with SSL): SMTP Submission Port (encryption via smtp starttls) - port 587 In short:

For incoming mail, try setting to POP3, mail.comcast.net, port 995.

For outgoing mail, try setting to SMTP, smtp.comcast.net, port 587.

Check require encryption / SSL / TLS / etc for both.

Require authentication checkboxes may be necessary.

Explanation:

Incoming mail server appears to be mail.comcast.net.

It does not seem to have the IMAP4 or IMAPS (IMAP4 over SSL) open (TCP 143 and 993, respectively).

It does seem to have both POP3 and POP3S (POP3 over SSL) open (TCP 110 and 995, respectively).

This can be found with a series of DNS lookups and telnet tests.

It appears the outgiong mail server is going to be smtp.comcast.net and port 587 (SMTP submission, which supports starttls for SSL) is open. I connected and from a EHLO can see it supports STARTTLS. Port 25 is also open.

The comcast.net relays as per MX records have port 25 open but are only MTA’s designed, it seems, to relay mail from other mail servers with proper reverse DNS lookups so as to prevent anybody relaying through them from home, starbucks, etc.

Ports list:

incoming mail maildrop-style, no encryption:
POP3 – port 110
IMAP – port 143

incoming mail maildrop-style, with encryption:
IMAP4 over SSL (IMAPS) – port 993
Secure POP3 (SSL-POP) – port 995

outgoing transfer / relay:
SMTP – port 25

outgoing “submission” (potentially with SSL):
SMTP Submission Port (encryption via smtp starttls) – port 587

]]> By: Anna http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-26097 Anna Sat, 09 Jul 2011 17:21:00 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-26097 So...up until a week ago, I was able to use Thunderbird to open my fowarded emails from my Speakeasy as well as my emails from my domains. Then, my Comcast went down due to a contractor. Since Comcast was reconnected today, I have been unable to either dowload or upload email using Thunderbird at home. (I was able to up/download email when out at Starbucks though) I have not changed any settings on Thunderbird. Speakeasy is receiving emails on their webhosting, but they are not getting to me via Thunderbird when I am home on Comcast internet. The error message when sending or receiving says that Thunderbird has timed out. Comcast says they can not help Speakeasy says they can not help my outgoing port is 587 IMAP mail server port is 110 (I have tried 25, 110,,993 and 587) none of them make any difference. Got any ideas? So…up until a week ago, I was able to use Thunderbird to open my fowarded emails from my Speakeasy as well as my emails from my domains.

Then, my Comcast went down due to a contractor.

Since Comcast was reconnected today, I have been unable to either dowload or upload email using Thunderbird at home. (I was able to up/download email when out at Starbucks though)

I have not changed any settings on Thunderbird. Speakeasy is receiving emails on their webhosting, but they are not getting to me via Thunderbird when I am home on Comcast internet.
The error message when sending or receiving says that Thunderbird has timed out.
Comcast says they can not help
Speakeasy says they can not help

my outgoing port is 587
IMAP mail server port is 110 (I have tried 25, 110,,993 and 587) none of them make any difference.
Got any ideas?

]]> By: lzardmnl http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-25305 lzardmnl Tue, 22 Feb 2011 04:24:22 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-25305 Thanks! We are using port 25 for the mobile gadgets SMTP settings but suddenly our users could not send emails to my server. We found out that Globe Telecom blocked this port so I tried port 587 and it works. Thanks! We are using port 25 for the mobile gadgets SMTP settings but suddenly our users could not send emails to my server. We found out that Globe Telecom blocked this port so I tried port 587 and it works.

]]> By: B. Davies http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-25130 B. Davies Tue, 01 Feb 2011 12:48:26 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-25130 Oh yeah ! port 587 for -mail ...works great Oh yeah ! port 587 for -mail …works great

]]> By: smtp using 587 http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-24910 smtp using 587 Mon, 20 Dec 2010 13:06:23 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-24910 [...] and 587. lot of spamfilter suggest to block port 25. i used postfix and centos. Take a look at http://www.mostlygeek.com/tech/smtp-on-port-587/ [...] [...] and 587. lot of spamfilter suggest to block port 25. i used postfix and centos. Take a look at http://www.mostlygeek.com/tech/smtp-on-port-587/ [...]

]]> By: Fernando http://mostlygeek.com/tech/smtp-on-port-587/comment-page-1/#comment-24707 Fernando Thu, 29 Jul 2010 00:33:12 +0000 http://www.mostlygeek.com/2006/12/06/smtp-on-port-587-this-is-very-interesting/#comment-24707 Danielle, the port 587 is to send emails via smtp. To receive you may configure the pop port as 995 if your provider enabled secure for POP and don't forget to click on: This server requires SSL connection if you like to send your emails on secure connection, but most important to discover qhat is happening is see the error.. another mistake is dont click on "my ingoing server (POP) requires authentication" dont forget this.. Good Luck! Danielle, the port 587 is to send emails via smtp. To receive you may configure the pop port as 995 if your provider enabled secure for POP and don’t forget to click on: This server requires SSL connection if you like to send your emails on secure connection, but most important to discover qhat is happening is see the error.. another mistake is dont click on “my ingoing server (POP) requires authentication” dont forget this..

Good Luck!

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