0
votes
0answers
121 views

Zimbra SMTP Reverse DNS Mismatch

I have a Zimbra email server. sending and receiving is fine, however When I use online tools to check that things are configured properly, I'm being told my reverse DNS SMTP Banner is wrong. ---- ...
0
votes
1answer
70 views

Two servers, severals domains, reverse DNS and blacklist

I will try to explain the context. 2 VPS with PLESK 11.5 The first (named vps67877.ovh.net - we call it v67) is a mail server (ip 37.187.33.38) The second (named vps68789.ovh.net - we call it v68) ...
1
vote
1answer
105 views

Reverse DNS lookup not resolving correctly

I've been searching and searching for the answer and I can't find it. My problem is that all of my emails sent from my server are either going to spam folders or not being delivered. I am trying to ...
1
vote
3answers
223 views

Are generic reverse DNS entries acceptable for an outgoing SMTP server?

Our PTR records are managed by our ISP, as our ranges are too small for them to consider delegating to us. So, every time I want to update an entry, I have to email their support team. In an effort ...
0
votes
1answer
666 views

Reverse DNS and Godaddy email server, What should it point to?

We are assigned 3 static IP addresses by our ISP and lately we have been having problems delivering our mail. We checked with Cloudmark and they suggested contacting our ISP to add a reverse DNS entry ...
0
votes
1answer
86 views

Reverse DNS is finding someone else's domain

When I do a reverse DNS of my IP address I'm finding a different server name? This isn't my domain name. I was testing my mail server and it gave that warning. How do I fix it? $ nslookup Default ...
4
votes
3answers
400 views

With regard to anti-spam practices, what exactly does a typical reverse DNS check look for?

My understanding is that a typical reverse DNS lookup will compare the SMTP hostname (provided in the EHLO/HELO command) of an incoming connection and verify that it matches the PTR record for the ...
1
vote
2answers
6k views

Reverse DNS does not match SMTP banner vs Reverse DNS mismatch

I have to make decision whether my Reverse DNS should match SMTP banner but Reverse DNS to DNS and vice versa stays different or vice versa. Which one to choose? I have an 2x Exchange 2010 server ...
1
vote
2answers
685 views

Why Is There A Delay In The SendMail SMTP Banner Greeting When Primary DNS Server Is Unavailable?

CentOS 5.x / SendMail Hi All, Normally when I connect to my SendMail server, I see the SMTP banner greeting almost instantly. I've noticed though, that when the primary DNS server is unavailable ...
0
votes
1answer
211 views

rDNS mx record problem, smtp test fails

down vote favorite I am doing test at mxtoolbox.com ptr: ip -> mydomain.com mx: mydomain.com ->myip but smtp:173.231.15.144 -> OK - myip resolves to myip.hosted.static.hostingfirm.com / Warning - ...
0
votes
2answers
1k views

My Reverse DNS PTR record seems to be right, but I'm still getting bouncing email

I have a service (statusme.com) where I let people know (for example) that their kid's soccer games are cancelled because of bad weather. We send out emails to the people who have registered. I have ...
1
vote
3answers
1k views

SMTP host name vs. domain in “From:” address vis-a-vis Email Deliverability

I'm trying to implement (or make sure that I'm correctly following) email sending best practices to improve deliverability, but the role of the smtp server's host name vs the domain name of the From: ...
3
votes
3answers
4k views

Multiple PTR records

In your experience, have you found there to be any actual problems with having redundant PTR records (same name, multiple IPs) for a given host? Additionally, would you expect to see corresponding A ...
1
vote
1answer
1k views

How to safely send newsletters on VPS (SMTP) w/ non-hosted domain as “From” email?

Greetings, I'm trying to understand the safest way to use SMTP. I'm considering purchasing a second virtual server mainly for email sending, on which I will set up PHPlist (a free open-source ...
0
votes
2answers
311 views

WAN IP displayed in Headers when sending via SMTP Virtual Server

On my Windows server 2008, I have IIS 7, ColdFusion 9, and the virtual SMTP service installed. I host several applications on the server that send emails using the virtual SMTP service. Each ...
1
vote
2answers
231 views

Is it ok that reverse DNS for my mail server resolves to www2.domain.com and not domain.com?

I am trying to make sure my mail server is set up correctly. One of the steps is to ensure that reverse DNS works. We email from ...@domain.com. When I test rDNS using nslookup i get: $ nslookup ...
0
votes
1answer
330 views

Failed reverse DNS and SPF only when using Thunderbird!

I have a reverse DNS and SPF records correctly setup for my mail server. Sending webmail from it works perfect. The problem is when Thunderbird sends out emails, it is using the client's IP address ...
8
votes
5answers
5k views

How important are PTR records for Email Servers?

Does anyone know of any studies done to show how much email will be rejected if there is not ptr record for the SMTP banner name of an email server? Are reverse checks always done when enabled, or ...
0
votes
2answers
155 views

EMail SMTP issue

I am running several websites on a Windows VPS that have "recommend this to a friend" type of emails. I get frequent bounces. The provider allows us to configure reverse DNS records for all the ...
7
votes
4answers
10k views

How does a Reverse DNS lookup work with regards to spam filters?

I have heard that most spam filters use a reverse DNS lookup on the originating IP address of the sending SMTP server (or something like that) as part of the verification process. I want to make sure ...
5
votes
5answers
31k views

How do I configure reverse DNS for a SMTP server [duplicate]

We use iis 6 to send out emails for our website but some email addresses bouce backs. It only appears to be 2 addresses. There is at least 100 different email addresses sent to at the same time as ...
7
votes
5answers
84k views

Reverse DNS - how to correctly configure for SMTP delivery

I started a new service and we need to send emails to our customers (new account confirms, etc). My server is known as prod01.bidrodeo.com and resolves to 97.107.134.38 . For reverse DNS, ...