Email Delivery Problems

**mmatchev** · #1 (**permalink**) 31-01-2010, 14:00

I'm by eukhost now for almost 2 weeks, and there is a problem with the emails delivery that can not be solved from the support team till now. I'm sharing my problem here in the hope that some of the users have a better idea how to solve the problem, or maybe someone of you have the same problem.

The problem is - all of the sent emails from the website bounce back with different kind of error messages.

Here are only few of the last rejections I got the last day:

"Remote SMTP Server Returned: 450 4.1.8 <contact@****.com>: Sender address rejected: Domain not found"

"554 Sorry, I am not accepting mail from 213.175.194.66 due to its poor reputation or lack of a DNS PTR record."

"Reason: Remote SMTP Server Returned: 451 4.1.8 Domain of sender address contact@****.com does not resolve"

"The remote mail server returned the error:
421 4.2.1 MSG=: (DNS:NR) [u rl =postmaster.info.aol.com/errors/421dnsnr.html]AOL Postmaster | Postmaster / AOL SMTP Error Messages[/ u rl] "

I have few companies and few websites on different hosting accounts. But I had never ever a problem with the email sending, and I never had a support team that can not resolve a problem for so long time.
Sending (and delivering) emails nowadays is a standard task a for a website as breading for human.

In addition the server is frequently down, for example last night for 2,5 hours.. it's getting annoying to spend countless hours to chat with the support and send ticket after ticket...

**eUK-Gareth** · #2 (**permalink**) 31-01-2010, 16:23

Hello Milan,

Many email hosting service provider like Hotmail, AOL prefer rDNS to connecting MTAs for email authentication. In your case AOL was rejecting emails as rDNS was not set to mail sever IP.I have set rDNS now and reconfigured your mail server. It will take some time for rDNS records to update and propagate.

Please initiate live chat support or send an email to vps [at] eukhost.com if you need further assistance.

Regards,
Gareth M.
Senior Technical Associate
VPS support Department.
eUkhost.com

**stapolinhost** · #3 (**permalink**) 31-01-2010, 23:26

Hey guys,

2 of my clients have had similar problems..

One was trying to set up email addresses for a newsletter 'newsletter@' & 'unsubscribe@' but when sending an email to either one, the emails would bounce back. But when using 'unsub@' there was no problems.

My other client send out a newsletter and he got nearly 100 emails bounce back to him.

This is the first time this has happened so I am wondering if something has changed, new security measure put in place maybe that might be blocking emails?

If anyone has an idea why this is happening some advice would be most appreciated.

Cheers guys,

Eoin

PS: just realised I posted this in the wrong forums.. my hosting is reseller cpanel, will copy and paste the post to proper forum.

**mmatchev** · #4 (**permalink**) 18-02-2010, 20:51

Dear Gareth
thank you for the efforts

Problem still exists and many of the sent emails bounce back.
Here is an example header of such email from today:

Message is waiting at xxxtion.com for delivery to pop.xxxxx.gr.

Message delivery has been delayed to the following recipients:
Recipient: [SMTP:info@xxxx.gr]
Reason: Remote SMTP Server Returned: 450 <contact@xxxtion.com>: Sender address rejected: Domain not found

It seems that must be investigated deeper.
Please, Take care to get that fixed once forever

Thank you
Milan

Quote:

Originally Posted by eUK-Gareth

Hello Milan,

Many email service provider like Hotmail, AOL prefer rDNS to connecting MTAs for email authentication. In your case AOL was rejecting emails as rDNS was not set to mail sever IP.I have set rDNS now and reconfigured your mail server. It will take some time for rDNS records to update and propagate.

Please initiate live chat support or send an email to vps@eukhost.com if you need further assistance.

Regards,
Gareth M.
Senior Technical Associate
VPS support Department.
eUkhost.com

**Philip S** · #5 (**permalink**) 18-02-2010, 22:29

Hello Milan,

We have thoroughly investigated and found the MX records are not responding properly which caused the problem.

We have restarted the dns service on server in order to fix the issue and able to send the pending mails from mail queue.

Please, check it and initiate live chat support or send an email to vps [at] eukhost.com if you need further assistance.

**mmatchev** · #6 (**permalink**) 28-05-2010, 12:23

It seems all of my email problems are solved.
Now after few months here, I can say - it's TOP hosting, good service, and for a reasonable price. I'm pretty happy with it!

**eUK-Gareth** · #7 (**permalink**) 28-05-2010, 12:48

Quote:

Originally Posted by mmatchev

It seems all of my email problems are solved.
Now after few months here, I can say - it's TOP hosting, good service, and for a reasonable price. I'm pretty happy with it!

Hello Milan,

It's really nice to know that your Email issue has been fixed.
And thanks for appreciation of our service, Your feedback really boost our quality of service.

Regards,
Gareth M.
Senior Technical Associate
eUkhost.com

eUK-Martin · #8 (**permalink**) 28-05-2010, 14:22

Quote:

Originally Posted by mmatchev

It seems all of my email problems are solved.
Now after few months here, I can say - it's TOP hosting, good service, and for a reasonable price. I'm pretty happy with it!

Thank you for the appreciation Milan.. I was reading the thread hoping that the problem may have occurred again but you really made me smile at the end.

There are very few percentage of people on this planet who take efforts to come back just to say "The problem is gone and I am now a happy client.."

Cheers mate.

**melvyn** · #9 (**permalink**) 29-06-2010, 11:21

We have had the same problem for two days and it has taken a long time to get telephone support to accept that the problem is with your setup of our account and not our internal systems. Very frustrating indeed.

Charles
on behalf of Melvyn

Rock · #10 (**permalink**) 29-06-2010, 17:40

Quote:

Originally Posted by melvyn

We have had the same problem for two days and it has taken a long time to get telephone support to accept that the problem is with your setup of our account and not our internal systems. Very frustrating indeed.

Charles
on behalf of Melvyn

Hi Melvyn/Charles,

The problem with the mail delivery failures was related to rDNS not being setup on your new Linux dedicated server.

A PTR record is the reverse of an A record. That is, it maps an IP address to a hostname, rather than vice versa. Given an IP address of the form a.b.c.d, the usual form for a PTR record is this:

Code:

d.c.b.a.in-addr.arpa. PTR host.name.

Most of the mail servers check whether there is a rDNS set for the IP from where the email is coming from & if there is no rDNS record set, it rejects the email considering it as spam. This is the reason why most of the people now a days set rDNS record for the main IP of the server (generally to the hostname of the server) as by default emails are routed out from the main IP of the server.

rDNS has now been setup on your Linux dedicated server now & the emails are working normally from it. Please let know if you still experience any problems..