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stoem

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Hello,
I recently started receiving bounced emails for two of my domains. Both domains' mail is handled by one server while the websites are served via another. flashcomguru.com is one of my domains and I am using my ISP to send email out, Kerio to receive.

Here's the message I am receiving:

(mail.tink.ws: 550-Verification failed for <stefan<.a.t.>flashcomguru.com>
550-Called: 69.56.201.238
550-Sent: RCPT TO:<stefan<.a.t.>flashcomguru.com>
550-Response: 503 This mail server requires authentication. Please check your mail client settings.
550-.
550-[EXIMCONFIGTAG-Sender-Callback]
550-.
550-VERIFY_ADDRESS_LPDOMAINContact: POSTMASTER 550-.
550-Sorry, your message has been rejected because 550-your sender address and/or domain name is 550-invalid or does not exist.
550-.
550-This was confirmed by perform)

There's obviously some kind of reverse lookup going on but I am not sure if this is due to a mail server configuration or some other domain related setup. How can I avoid this?
Any advise you can offer would be appreciated.

Thanks

Stefan
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stoem

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can noone help? It does not appear to be a mail client setting as I am using authentication on my end. However the server receiving the email appears to reject my domain...
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freakinvibe

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So is this happening when you try to send mail out?

I suppose your sender address is stefan<.a.t.>flashcomguru.com.

But who are you trying to send to, who is the recipient?

Is that happening for all recipients or just for some outgoing mails?

Regards,

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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stoem

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This is happening for only 2 recipients.
Yes, the sender is stefan<.a.t.>flashcomguru.com and the receiving domain is blurthelines.com

It appears that the blurthelines mailserver is bouncing my email at SMTP time by doing some sort of domain lookup which fails for my domain. I can't figure out why this is, or whether it is a mail server setting on my end or a DNS issue.

I have no trouble sending mail to anyone else expect this domain and one other (can't remember now which one that was) which gave me a similar bounce.

Happy to hear any suggestions.

Stefan
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stoem

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could this be the cause (from my whois info):

[DNS Information on 69.56.201.238]
Whois Domain Lookup on ip 69.56.201.238 has been requested but failed
DNS Error while getting PTR record for ip


69.56.201.238 is the IP for flashcomguru.com (website). What is a PTR record and is it important?

Stefan
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freakinvibe

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That could be the cause. Some mail servers do a lookup of the PTR record.

The reverse DNS lookup is checking a given IP address and giving back the associated host name. You should ask your ISP to associate a PTR record with your IP address.

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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stoem

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thanks I am doing that.
Problem: apparently only one IP can be tied to one domain by PTR, meaning that only one domain on that server (which serves dozens of domains) can be PTR'ed.
Does this really mean I will need a dedicated IP for each domain on that server? Seems silly...

Thx

Stefan
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freakinvibe

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You need just one PTR record. Even if it doesn't match your hostname. Having no PTR record, though, will fail with some mail servers.

regards, Pascal

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