Spam Filter ISP Forums : Sender Verification with Internet America https://www.logsat.com/spamfilter/forums/ Sun, 12 Jul 2026 17:03:38 +0000 Tue, 16 Mar 2004 13:58:00 +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=3250 <![CDATA[Spam Filter ISP Forums]]> https://www.logsat.com/spamfilter/forums/forum_images/web_wiz_forums.png https://www.logsat.com/spamfilter/forums/ <![CDATA[Sender Verification with Internet America : Keizersozay, You are being...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3258&title=sender-verification-with-internet-america#3258 Author: Desperado
Subject: 3250
Posted: 16 March 2004 at 1:58pm

Keizersozay,
 
You are being way to polite by calling them idiots.  Sender verification is a security hole, not Spam prevention.  Here is a quote from Sendmail.org:

novrfy

When this privacy flag is enabled, sendmail doesn't allow remote sites to perform VRFY commands on addresses.

novrfy is the default and recommended setting. Turning this privacy flag off allows external "bots" to "Harvest" email addresses.

Regards,

Dan S.

]]> Tue, 16 Mar 2004 13:58:00 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3258&title=sender-verification-with-internet-america#3258 <![CDATA[Sender Verification with Internet America : We had this diacussion way back...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3257&title=sender-verification-with-internet-america#3257 Author: Desperado
Subject: 3250
Posted: 16 March 2004 at 1:49pm

We had this diacussion way back ... follow the thresd:

http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=1934

Dan S.

]]> Tue, 16 Mar 2004 13:49:00 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3257&title=sender-verification-with-internet-america#3257 <![CDATA[Sender Verification with Internet America : Sometimes the simplest issue is...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3253&title=sender-verification-with-internet-america#3253 Author: bpogue99
Subject: 3250
Posted: 16 March 2004 at 11:39am

Sometimes the simplest issue is a huge mess with these ISP's. They keep demanding that I put my Exchange server at the front door... which isn't going to happen. To work around this I've had to open the following door with 209.196.77.* in the white listed IP's. I traced all the airmail.net servers that I've seen connect to this server and they are all in that subnet. This allows there sender verification to work with a blank email from. I've sent them copies of the logs and such, we'll see, they've been slow to respond but I'll let you know what happens.

Hope this helps!

bill

]]> Tue, 16 Mar 2004 11:39:00 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3253&title=sender-verification-with-internet-america#3253 <![CDATA[Sender Verification with Internet America : Hey Bill, I have gone round and...]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3252&title=sender-verification-with-internet-america#3252 Author: Guests
Subject: 3250
Posted: 16 March 2004 at 11:16am

Hey Bill,

I have gone round and round with air-mail in the past, and long story short, they are idiots.
http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=1934
http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=2072
these are my two previous posts about this same issue. they simply refuse to cooperate. I ended up having to accept mail with a blank sender so my people could communicate. sorry to burst your bubble but that is probably the only way to make it work. if you do figure something else out please post it so I can use it as well.

]]> Tue, 16 Mar 2004 11:16:00 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3252&title=sender-verification-with-internet-america#3252 <![CDATA[Sender Verification with Internet America : Here&#039;s an interesting challenge......]]> https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3250&title=sender-verification-with-internet-america#3250 Author: bpogue99
Subject: 3250
Posted: 16 March 2004 at 10:37am

Here's an interesting challenge... Internet America, airmail.net, apparently has implemented a sender verification process for all emails received. As explained by their tech department their server does this to avoid junk email. However, when their server does the sender verification our Spam Filter denies the request because it's not a mailbox server, it's only an email filter. When they do the sender verification it forms an email and then tries a basic helo, mail from, rcpt to... just to verify that the rcpt to passes. The rub with this is the following:

03/16/04 09:25:38:532 -- (8224) Connection from: 209.196.77.99  -  Originating country : United States
03/16/04 09:25:38:704 -- (8224) Resolving 209.196.77.99 - mx2.airmail.net
03/16/04 09:25:38:704 -- (8224) Bypassed all rules for: Administrator@ourhost.com from
03/16/04 09:25:38:735 -- (8224) Disconnect

They use a blank sender for the verification process. Internet America support is telling me to make my end RFC compliant by putting my mail server as the device anwering the sender verification, but they're using a blank sender?

BUT, if I add users to the Unfiltered white list... the verification will pass just fine. For example, that administrator@ourhost.com above passes the sender verification because its in the unfiltered. But if the sender is not in that list, the verification fails because the sender is blank. I've asked Internet America to put a valid sender in their sender verification email and things will work just fine probably.

Any thoughts on how to get around this? The CEO of one of my customers tries to email his lawyer who uses Internet America and it never goes through. <g>

Thanks!

bill

]]> Tue, 16 Mar 2004 10:37:00 +0000 https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=3250&PID=3250&title=sender-verification-with-internet-america#3250