All Questions
Tagged with smtp domain-name-system
136
questions
0
votes
1
answer
249
views
mx record with IPv6 AAAA host
I need to setup a mail server or mx record with a IPv6 address
I have written a AAAA record which is working fine (pings, ports) here
I have setup hmailserver and checked all ports(587, 143) with ...
0
votes
2
answers
427
views
Root domain in SPF record instead of full hostname
Can i use root domain like google.com instead of _spf.google.com in SPF record?.
My SPF record
v=spf1 include:_spf.mx.cloudflare.net include:_spf.google.com include:mxsmtp.sendpulse.com +a +mx ~all
...
0
votes
1
answer
1k
views
Setting up an MX record for a send-only server
I have set up a send-only server and I have tested it using mail-tester.com.
I get a 7/10, and I experience a majority of outlook/msn/hotmail inboxes sending my email to the junk folder. I do know ...
- 45
0
votes
0
answers
1k
views
Do I need a PTR (rDNS [Reverse DNS]) record if using an SMTP mail relay (Mailgun, Mailjet, Send Grid, etc.)?
My cloud hosting provider wants to charge for setting up a PTR record, which I'm not up for.
As I use Mailjet as an SMTP relay server, do I even need to have it setup? Or will all my emails reverse to ...
- 219
0
votes
1
answer
207
views
Local mail exchange with DNS servers
I have a problem with correctly setting up a working infrastructure for testing mail spoof preventing mechanisms.
As stated in a graph below, I have 2 mail servers (centos1 & 2) and 2 DNS servers. ...
- 19
1
vote
2
answers
2k
views
DNS MX record and SMTP server
I have a SMTP server. DKIM is setup and working and have also setup SPF.
The SMTP host is smtp.domain.com
On the DNS I have a A record with smtp pointing to the IPv4 and a AAAA record with smtp ...
- 2,095
0
votes
1
answer
2k
views
Multiple IP addresses - set the primary
I have a SMTP server in Hetzner Cloud. Have added floating IPv4 and IPv6 (in case I switch server and the IP's can follow to the new server)
How to set the floating IP's as primary?
When a client ...
- 2,095
1
vote
1
answer
779
views
Sendmail - retry instead of permanent failure on DNS errors
The last few days, our hosting provider has had occasional connectivity issues with one of their upstreams. Each time this happens, we end up with a heap of outbound emails that Sendmail gives up on.
...
- 11
2
votes
3
answers
9k
views
Configuring SMTP through Cloudflare
My domain registrar is Cloudflare and my site is hosted through A2 Hosting. My problem is that my email worked fine when A2 Hosting was my domain registrar and web host. Now, neither Thunderbird or ...
1
vote
1
answer
1k
views
How to connect to mail.hotmail.com via port 25 from DNS as instructed by Outlook
If you read https://sendersupport.olc.protection.outlook.com/pm/troubleshooting.aspx, it says
Confirm that your DNS is set up correctly
Try connecting to mail.hotmail.com via port 25. If you are ...
- 63
4
votes
1
answer
410
views
Load balacing email servers: MX vs A/AAAA vs Anycast IP
I'm curious about what are the differences and considerations when implementing email server load balacing between these three methods:
Multiple MX records with the same priority/preference number
...
user578638
0
votes
1
answer
895
views
What should be the SMTP server when using the Amazon MAIL FROM domain?
I have set up a MAIL FROM domain with Amazon SES by following their instructions: https://docs.aws.amazon.com/ses/latest/DeveloperGuide/mail-from.html
They have verified that the DNS records were set ...
- 15
0
votes
1
answer
498
views
Inaccessible SMTP server, no error from mailer daemon
I would like to know what behavior should I expect, when I try to send an email to an address where the corresponding server has no working SMTP daemon instance running (for whatever reason).
My ...
- 3
0
votes
1
answer
3k
views
SMTP Server and HTTP Server on a single VPS [closed]
I have a VPS (CentOS 7) with an Apache HTTP server already running on it, with its own domain. But, I also want to send emails from that domain, so that I have a website called example.com and I can ...
4
votes
1
answer
1k
views
Size of SPF with other TXT records
The SPF specification says:
The published SPF record for a given domain name SHOULD remain
small enough that the results of a query for it will fit within 512
octets. Otherwise, there is a ...
- 6,968