Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [mx-record]

The MX record is a type of resource record in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain.

734 questions
99
votes
6 answers

Why can't MX records point to an IP address?

I understand you should not point a MX record at an IP address directly, but should instead point it to an A record, which, in turns, points to the IP address of your mail server. But, in principle, why is this required?
dayuloli
  • 1,223
  • 1
  • 10
  • 18
45
votes
6 answers

DNS using CNAMEs breaks MX records?

We are trying to move all our websites we host to CNAMES as we are planning on moving servers in the new year and would like the ability to move some clients to one server and other clients somewhere else. We were planning on giving clients a unique…
johnwards
  • 765
  • 1
  • 9
  • 13
41
votes
8 answers

Can you lookup a domains past nameserver & mx record history?

If is possible to find out which nameservers a domain was previously pointing too? I need to try and find where a domain was previously hosted so that I can try and gain access to an old hosted email account. Any ideas?
Luke McCallum
  • 743
  • 1
  • 6
  • 8
28
votes
4 answers

Best Practices for preventing you from looking like a spammer

I'd like to feel more confident setting up mail for my clients with regards to false positives. Here's what I know: SPF records are good, but not every spam filter service/software (SFSS) uses them. reverse DNS (PTR) records are pretty much a…
gravyface
  • 13,947
  • 16
  • 65
  • 100
22
votes
4 answers

DNS: Is it valid to have an "MX" record and no "A" record?

Say you own a abcd.com and you only want to use it to send and receive email via bob@abcd.com. You don't want to provide any kind of website. Can you set up the DNS records to include an "MX" record and no "A" record? Is this enough for sending and…
xyz
  • 501
  • 1
  • 7
  • 13
21
votes
2 answers

Is it bad practice to declare MX from differing networks?

We're using a 3rd-party service provider to send transactional email. I recently noticed increased failure rates for a given receiving domain. The sends fail with the error "498 No MX for example.com". The sends are retried after a given delay and…
Oliver Salzburg
  • 4,505
  • 16
  • 53
  • 80
21
votes
8 answers

DNS: Subdomains that Require Both an MX Record and a CNAME

Let us say we own the zone mywebservice.com. I would like each of my customers to get their own subdomain, such as customer.mywebservice.com. customer.mywebservice.com needs to be a CNAME to a given server offsite. Since that site manages its own…
Michael Gorsuch
  • 2,358
  • 1
  • 21
  • 24
19
votes
2 answers

Is it possible to set two MX records for one domain?

I've seen articles about "different subdomains for different MX records". But I want two records for the same domain, @abc.example for example. Originally, I used Live Mail(MSN) to host my emails, and already have MX setup for it. Now I want to use…
9am-5pm com
  • 195
  • 1
  • 1
  • 5
18
votes
4 answers

How do I set an MX record in Route53 for a GoDaddy domain?

Can't seem to find an answer to this question on AWS' forum, not in the Route53 manual, nor on Stackoverflow/Serverfault in a way that makes sense...and GoDaddy's support sure as heck ain't got an answer: How do I set an MX record in Route53 for a…
Sean
  • 478
  • 1
  • 4
  • 10
17
votes
2 answers

Server 2012R2 DNS server returning SERVFAIL for some AAAA queries

(Rewriting most of this question since a lot of my original tests are irrelevant in light of new information) I'm having issues with Server 2012R2 DNS servers. The biggest side effect of these issues is Exchange emails not going through. Exchange…
Grant
  • 17,671
  • 14
  • 69
  • 101
17
votes
1 answer

MX Records - go to two servers?

Right now I have a single mail server for IMAP. Let's say I want to introduce Exchange but not all users will be on it. Some users will be on my "legacy" IMAP, others on the "new" Exchange. Is it possible to "split up" your users (from the same…
Unknown Coder
  • 279
  • 1
  • 2
  • 8
17
votes
2 answers

DNS MX/SPF/DMARC records without actuall emails on domain

I created website for someone, but also someone (I guess some SEO guy) told this person that I made big mistake because there are missing DNS records on domain (mx, SPF, dmarc). Now I need to "fix" my error. Thing is, of course these records are…
norr
  • 273
  • 1
  • 5
15
votes
2 answers

Can you reference a CNAME record in an MX record?

We have several domains all pointing their MX records at mail.ourdomain.com, an internal mail server. We are looking to outsource our email to a new supplier, who would like us to use mail.newsupplier.com; their mail server. We'd rather not change…
NeilS
  • 253
  • 2
  • 4
14
votes
10 answers

Using fake MX records to combat spam

I have a client that is getting heavily spammed.. It's the 15th of the month and POP3 bandwidth is almost 100 GB. There are only 7 e-mail accounts on this domain. I installed SpamAssassin set it to 5 and setup 10-20 filters reject most of the junk.…
Mikey1980
  • 711
  • 1
  • 8
  • 12
13
votes
4 answers

Are separate dns records necessary for web and mail on a single server?

When setting up a web/mail server on a single server or VPS with one IP address almost every guide online follows the same structure for DNS: example.com. IN A 192.0.2.0 hostname.example.com. IN A 192.0.2.0 …
Jeff
  • 133
  • 6
1
2 3
…
48 49