Spam Filter ISP Forums : 451 4.4.1 reply: read error https://www.logsat.com/spamfilter/forums/ Thu, 11 Jun 2026 03:07:13 +0000 Fri, 14 Jul 2006 23:09:39 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.04 360 https://www.logsat.com/spamfilter/forums/RSS_post_feed.asp?TID=5543 <![CDATA[Spam Filter ISP Forums]]> https://www.logsat.com/spamfilter/forums/forum_images/web_wiz_forums.png https://www.logsat.com/spamfilter/forums/ <![CDATA[451 4.4.1 reply: read error : Patricia, OK ... Good deal. I...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8529&title=451-441-reply-read-error#8529 Author: Desperado
Subject: 5543
Posted: 14 July 2006 at 11:09pm

Patricia,

OK ... Good deal.  I am also Cisco Certified.  That and 2 bucks will get me a Starbucks!  Let me know by PM if you still have issues.  I have had one or 2 issues with odd smpt handling with PIX but it was usually the way the user set up the translations.

]]> Fri, 14 Jul 2006 23:09:39 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8529&title=451-441-reply-read-error#8529 <![CDATA[451 4.4.1 reply: read error : Dan, No matter... I knew that...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8525&title=451-441-reply-read-error#8525 Author: Guests
Subject: 5543
Posted: 14 July 2006 at 2:10pm

Dan,

No matter... I knew that you typed the wrong port for the SMTP... But i tested the 25 port.

We have a company looking at this now... They have Cisco certified people. I think they will try to downgrade the IOS Cisco Version.

Thanks any way.

Patricia.

]]> Fri, 14 Jul 2006 14:10:00 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8525&title=451-441-reply-read-error#8525 <![CDATA[451 4.4.1 reply: read error : Patricia, I get tired and type...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8523&title=451-441-reply-read-error#8523 Author: Desperado
Subject: 5543
Posted: 14 July 2006 at 11:23am

Patricia,

I get tired and type very badly ... as you saw above before I edited the port number.  Do you have someone who know the PIX real well?

]]> Fri, 14 Jul 2006 11:23:15 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8523&title=451-441-reply-read-error#8523 <![CDATA[451 4.4.1 reply: read error : Correcting: &#034;putting the...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8521&title=451-441-reply-read-error#8521 Author: Guests
Subject: 5543
Posted: 14 July 2006 at 9:04am

Correcting:  "putting the only firewall" = "putting the other firewall (Sonicwall)"

 

]]> Fri, 14 Jul 2006 09:04:46 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8521&title=451-441-reply-read-error#8521 <![CDATA[451 4.4.1 reply: read error : Hi Dan, It seems like the fix...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8520&title=451-441-reply-read-error#8520 Author: Guests
Subject: 5543
Posted: 14 July 2006 at 9:01am

Hi Dan,

It seems like the fix up isn't configured. I did the test with telnet and i saw my server banner. Thank you anyway. It must be another thing, but we tested putting the only firewall and the emails was received correctly. So the problem is really the PIX. But not the fix up configuration. We are still looking for something else.

Thanks,

Patricia.

]]> Fri, 14 Jul 2006 09:01:57 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8520&title=451-441-reply-read-error#8520 <![CDATA[451 4.4.1 reply: read error : Patricia, Are you looking at...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8514&title=451-441-reply-read-error#8514 Author: Desperado
Subject: 5543
Posted: 13 July 2006 at 8:42am

Patricia,

Are you looking at a TFTP'd configuration ... looking at the PDM, or what?  Do you see any "Fixup Protocol" statements?   You can tell if the fixup is configured by telnetting into the mail server on port 25 from OUTSIDE the Firewall.  If you see the server banner, the fixup id off.  If you see a bunch od stars instead, it is on.  Some mail servers choke on a "fixed up" mail banner ... others do not.



Edited by Desperado]]> Thu, 13 Jul 2006 08:42:18 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8514&title=451-441-reply-read-error#8514 <![CDATA[451 4.4.1 reply: read error : Hi Dan, I looked at the pix configuration...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8510&title=451-441-reply-read-error#8510 Author: Guests
Subject: 5543
Posted: 12 July 2006 at 5:11pm

Hi Dan,

I looked at the pix configuration and there isn't any "fixup protocol smtp 25", should i still put the "no fixup protocol smtp 25"? I'm not a Pix expert.

Another question: my pix is running "PIX Version 7.0(4)" did i still need the configuration?

Thanks,

Patricia.

 

]]> Wed, 12 Jul 2006 17:11:16 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8510&title=451-441-reply-read-error#8510 <![CDATA[451 4.4.1 reply: read error : Patricia, Just for laughs, can...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8509&title=451-441-reply-read-error#8509 Author: Desperado
Subject: 5543
Posted: 12 July 2006 at 2:29pm

Patricia,

Just for laughs, can you shut off the "Fix-Up" for SMTP on your pix.

no fixup protocol smtp 25

And try again?

fixup protocol smtp 25  will put it back.

]]> Wed, 12 Jul 2006 14:29:55 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8509&title=451-441-reply-read-error#8509 <![CDATA[451 4.4.1 reply: read error : Hi Lyndon, I was reading your...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8508&title=451-441-reply-read-error#8508 Author: Guests
Subject: 5543
Posted: 12 July 2006 at 2:14pm

Hi Lyndon,

I was reading your post of 08 March 2006, and it seems the same problem i'm having here. Did you find a solution?

Here the problem occurs with only one company trying to send emails to us. And it seems the problem happened after we have changed the firewall that was a Sonicwall to a Cisco Pix. They say that they only have problem sending email to us. And we are only having problem receiving emails from them.

 ----- The following addresses had permanent fatal errors -----
<paulosilva@domain.com.br>
   (reason: 451 4.4.1 reply: read error from server.domain.com.br.)
Transcript of session follows -----
451 4.4.1 reply: read error from server.domain.com.br.
danieltavares@domain.com.br. Deferred: Connection timed out with server.domain.com.br.
Message could not be delivered for 4 hours
Message will be deleted from queue

Best regards,

Patricia.

]]> Wed, 12 Jul 2006 14:14:44 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8508&title=451-441-reply-read-error#8508 <![CDATA[451 4.4.1 reply: read error : With you not using Spam Filter...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8279&title=451-441-reply-read-error#8279 Author: lyndonje
Subject: 5543
Posted: 19 June 2006 at 9:07am

With you not using Spam Filter ISP, I'm unable to replicate your setup and therefore can only give you limited help.

My first guess is that the 3rd parties server (or Outlook client) issending the email via port 25, it may be set to deliver direct torecipeints server, or to forward out using FS servers (or another).Regardless of which, AOL are passing all outbound port 25 requests totheir SMTP Proxy. And this is the unknown which I think may be causingyou problems:

1) Does the AOL SMTP Proxy act as a true proxy - ie does it Proxy yourconnection to the destination server in real time? Passing back andforth SMTP commands and responses between the sending and receivingservers?

or

2) Does the AOL SMTP Proxy act as a middle man, In that the AOL serverintercepts the outbound port 25 connection, and accepts the email fromthe senders sever (issuing them a 2xx code on completion). Then the AOLProxy tries to connect to your server, which fails and is issued a 4xxerror. As the AOL Proxy has limited functionality due to it being a'proxy' and not a 'full' SMTP server, it may then send the bounce backto sender opposed to retrying. As the senders server is not the onereseiving the 4xx code, it does not know that is must retry the email,and just delivers the bounce back.

To fill in a few blanks
- does your greylist work on sending IP or senders email?
- is the sender sending through their own mail server (Exchange) or mail client (Outlook)

If statement 1 above is true, the error is likely to lie with thesenders server (assuming the answer to my 2nd 'blank' question above is'mail server') as it is their server not responding correctly to a 4xxerror. Or if it is, and your greylist works based on the same IPre-sending an email, and the external AOL SMTP Proxy IP is different onthe second connection then the 1st, then there is your problem. You'llobviously need to check your logs to confirm this.

If statement 2 above is true, and AOL are not correctly responding to a4xx error, then as AOL are unlikely to change anything there is littleyou can do. Other than blame AOL and suggest the sender uses a morebusiness focused ISP and explain to your customer that AOL do notconform to standards in that it does not retry based on a 4xx error. Ifhowever AOL do retry sending the email, but again make the connectionfrom a different external IP (and your greylist works on IP) then its alimitation in your greylist server in that it requires an email to beresent from the same IP, which in this case, and possibly other casesmay not be so. In which case I'd see this as a flaw with greylistingunless there is someway to get around this. If this is the case you'llneed to seek help from other users of your greylisting software orgreylisting groups in general.

Regards,
Lyndon.
]]> Mon, 19 Jun 2006 09:07:20 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5543&PID=8279&title=451-441-reply-read-error#8279