I´m seeing that a lot of servers are rejecting my emails showing this error:
451 - could not verify sender (callout)
Reverse DNS is working fine, and I couldnt see any kind of error on dnsstuff.com.
I´m using EXIM/CPANEL. I tried to send from one cpanel server to another cpanel server and I´m still getting error.
We had a non-client (not on our server) that was getting 550 email rejections when he attempted to email us due to having Sender Verify enabled.
In the past I figured Sender Verify was necessary for fighting spam, amongst other things, but have realized that we may be having more rejections than we know because we never hear about them.
Is there a general best practice in terms of enabling Sender Verify or leaving it off? I've never heard about complaints about rejects from legitimate emails senders, so it doesn't seem to be an issue, but then again, you really never know...
I have this customer who have been having trouble to receive some emails from valid senders due to Sender verify failed, both senders have valid accounts.
Here is an example,
De: MDaemon at zeus.XServer.com [mailto:MDaemon@zeus.XServer.com]
Enviado el: sábado, 17 de noviembre de 2007 11:16 a.m.
Para: albertocarbone@XServer.com
Asunto: Error permanente de entrega
Failed address: jsoler@CustomerDomain.com
--- Session Transcript ---
Sat 2007-11-17 11:15:19: Parsing message
[xxxxxxxxxxxxxxxxxxxxxxxxpd35000148823.msg]
Sat 2007-11-17 11:15:19: * From: albertocarbone@XServer.com
Sat 2007-11-17 11:15:19: * To: jsoler@CustomerDomain.com
Sat 2007-11-17 11:15:19: * Subject: RE: Zona Franca.- Concepto.-
Sat 2007-11-17 11:15:19: * Message-ID:
[003201c82934$ba953d00$2fbfb700$@com]
Sat 2007-11-17 11:15:19: Intentando SMTP conexión con [CustomerDomain.com]
Sat 2007-11-17 11:15:19: Resolviendo registros MX para [ CustomerDomain.com]
(Servidor DNS: 200.118.2.66)...
Sat 2007-11-17 11:15:23: * P=000 S=000 D=CustomerDomain.com TTL=(240)
MX=[ CustomerDomain.com] {xx.xxx.13.172}
Sat 2007-11-17 11:15:23: Intentando SMTP conexión con [xx.xxx.13.172:25]
Sat 2007-11-17 11:15:23: Esperando la conexión del socket...
Sat 2007-11-17 11:15:23: * Conexión establecida (xx.yyy.51.30:3948 -]
xx.xxx.13.172:25)
Sat 2007-11-17 11:15:23: Esperando la iniciación del protocolo...
Sat 2007-11-17 11:15:25: [-- 220-svr01.customerDomainHost.com ESMTP Exim 4.68 #1
Sat, 17 Nov 2007 11:15:29 -0500
Sat 2007-11-17 11:15:25: [-- 220-We do not authorize the use of this system
to transport unsolicited,
Sat 2007-11-17 11:15:25: [-- 220 and/or bulk e-mail.
Sat 2007-11-17 11:15:25: --] EHLO zeus.XServer.com
Sat 2007-11-17 11:15:25: [-- 250-svr01.customerDomainHost.com Hello zeus.XServer.com
[xx.yyy.51.30]
Sat 2007-11-17 11:15:25: [-- 250-SIZE 52428800
Sat 2007-11-17 11:15:25: [-- 250-PIPELINING
Sat 2007-11-17 11:15:25: [-- 250-AUTH PLAIN LOGIN
Sat 2007-11-17 11:15:25: [-- 250-STARTTLS
Sat 2007-11-17 11:15:25: [-- 250 HELP
Sat 2007-11-17 11:15:25: --] STARTTLS
Sat 2007-11-17 11:15:26: [-- 220 TLS go ahead
Sat 2007-11-17 11:15:26: SSL negotiation successful (TLS 1.0, 1024 bit key
exchange, 128 bit RC4 encryption)
Sat 2007-11-17 11:15:26: --] EHLO zeus.XServer.com
Sat 2007-11-17 11:15:26: [-- 250-svr01.customerDomainHost.com Hello zeus.XServer.com
[xx.yyy.51.30]
Sat 2007-11-17 11:15:26: [-- 250-SIZE 52428800
Sat 2007-11-17 11:15:26: [-- 250-PIPELINING
Sat 2007-11-17 11:15:26: [-- 250-AUTH PLAIN LOGIN
Sat 2007-11-17 11:15:26: [-- 250 HELP
Sat 2007-11-17 11:15:26: --] MAIL From:[ albertocarbone@XServer.com
[mailto:albertocarbone@XServer.com] ]
SIZE=23231
Sat 2007-11-17 11:15:26: [-- 250 OK
Sat 2007-11-17 11:15:26: --] RCPT To:[jsoler@CustomerDomain.com]
Sat 2007-11-17 11:15:30: [-- 550-Verification failed for
[albertocarbone@XServer.com]
Sat 2007-11-17 11:15:30: [-- 550-Called: 82.165.181.92
Sat 2007-11-17 11:15:30: [-- 550-Sent: RCPT
TO:[albertocarbone@XServer.com]
Sat 2007-11-17 11:15:30: [-- 550-Response: 550 Backscatter Protection
detected an invalid or expired email address
Sat 2007-11-17 11:15:30: [-- 550 Sender verify failed
Sat 2007-11-17 11:15:30: --] QUIT
--- End Transcript ---
Here is another example
2007-11-19 11:50:19 H=dom21.ipowerweb.com [72.22.92.57] sender verify fail for [hguzman@hoftxxx.net]
2007-11-19 11:50:19 H=dom21.ipowerweb.com [72.22.92.57] F=[hguzman@hoftxxx.net] rejected RCPT [jsoler@CustomerDomain.com]: Sender verify failed
Both accounts are valid.
in the last few months Ive got a blacklist warning from spamcop over my server sending bounces and now I find out one of my ips is listed at [url]for doing sender verify and bounces.
I think both of which are ridiculous to blacklist for and I really think most of the anti-spam blacklist people are nothing more then money making rackets. But I guess it seems reasonable to disable these things as it would save some resources.
Anyway what I need to do I guess is only do bounces for local users and disable sender verify. What is the best way to do this with exim?
Every server I have to change is cpanel. Ive googled on this the last 2 days and cant find much info, Mailservers isnt my strong point for sure. Any advice Id appreciate.
UPDATE I found how to disable callouts [url]
Just trying to figure out how to disable bounces now
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