-2
votes
0answers
11 views

mailman mails go directly to spam [duplicate]

I am using a mailman installation and from there managing a mailing list. The issue is that all outgoing mail is directly sent to spam for every user. The server is not in blacklists or anything, the ...
0
votes
1answer
78 views

Reverse dns for web/mail server with single ip

I have a single server with single ip running a web server, mail server and bind (all for a single domain). In my DNS zone file I created A records for www.domain.com, mail.domain.com, ns.domain.com ...
0
votes
1answer
76 views

Reverse dns and SaaS Spam Filters

We have an exchange server in the office that for a year or so has just used the built-in spam filters - we have added the SpamHaus IP addresses so that some basic spam filtering is done. However, ...
1
vote
1answer
100 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 ...
0
votes
0answers
80 views

The email sent from my server are marked as spam

I have a dedicated server at OVH. For several days I've noticed I'm in a spam list (spamcannibal). The reason I said was for generic PTR. I've changed and I have commanded to remove from the list. ...
4
votes
3answers
383 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 ...
0
votes
2answers
214 views

Reverse DNS for mail server [duplicate]

Possible Duplicate: How does a Reverse DNS lookup work with regards to spam filters? I have a question about setting a reverse DNS record for my mail server. Which is the best way to ...
1
vote
3answers
2k views

spam problem related to reverse dns config

I have a client whose ISP recently switched their circuit and static IP to an IP that was already blacklisted for SPAM (nice). The client is running Windows SBS 2003 with Exchange 2003 and DNS for ...
2
votes
3answers
3k views

Exchange 2007 Delivery Delayed (maybe need certificate?)

Last week, I setup a new domain and Exchange Server 2007 SP1. I created new accounts and mailboxes for my 30 users and imported all mail from their old domain to this new server. It's a Hub Transport ...
0
votes
1answer
160 views

Does RDNS for mail server have to match the mail server hostname exactly?

Typically when setting up a mail server, I create an rDNS record for the mail server IP to match the mail server hostname (ex: mail.example.com). Can I instead set the rDNS ptr to match the parent ...
0
votes
3answers
99 views

Does “From” field have to have the same domain as the reverse DNS to not be considered spam?

I have 2 applications at the same IP with 2 different domain names. Hourjar uses noreply@hourjar.com for the "From" field when it sends emails, and Nimikri uses noreply@nimikri.com. If my my reverse ...
2
votes
4answers
207 views

Does sending e-mail in the name of customers increase the risk of being marked as spammer?

We are developing a SaaS website application that lets users send invoices to their clients. Ideally, these e-mails should appear to be originating from our customers, so the sender e-mail address ...
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 ...
2
votes
4answers
726 views

Is OpenDNS safe to use in a location with Exchange/Reverse DNS

I like OpenDNS, but was wondering if anyone has experience deploying it for a location with an Exchange installation. I'm concerned specifically about whether any filtering they do would cause ...