All Questions
12 questions
0
votes
1
answer
114
views
SMTP - How to send mail as @example.com when example.com cannot be used as source server/IP
I have run into a bit of an issue when attempting to set up a mail system where the parent domain, example.com, already has A records and a web server as well as many clients utilizing the parent ...
- 1
0
votes
2
answers
521
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
...
1
vote
1
answer
3k
views
postfix: how to force IPv4 through SMTP?
Problem
I have successfully set up a Postfix mailserver with an SMTP interface, set up DKIM, DMARC, SPF, all that stuff.
But I had a problem when testing the delivery of emails to Gmail.
Namely, SPF ...
- 137
0
votes
1
answer
1k
views
Setup DNS records for SMTP send-only server
I have website on hosting with domain exmpl.com.
I have DNS record for exmpl.com:
exmpl.com MX(10) mail.exmpl.com
mail.exmpl.com A XX.XX.XX.XX
exmpl.com TXT v=spf1 +a +mx +a:hosting.server ~all
All ...
-1
votes
1
answer
4k
views
Unable to send email to gmail account from my mail server
I've created a mail server and have setup a PTR record from the ISP to my static IP server. The mail server works well and am able to send and receive emails and send mails to many email addresses ...
- 109
1
vote
1
answer
371
views
SPF errors on a new domain name
I'm new to web hosting and configuring emails, and I was hoping I could get some help.
I purchased a reseller account and I set up my first cPanel account on a domain that I have. I then created a few ...
- 11
2
votes
2
answers
2k
views
Multiple mail servers and reverse DNS
If I have three mail servers MS1, MS2 and MS3 all with different IPs but share the same domain name (exampledomain.com) and I use an SPF record to specify them, how would reverse DNS work on the ...
- 43
1
vote
2
answers
48
views
sending emails from different Smtps in different IPs
I sent mails with different Smtps for example Smtp1 on IP 1.1.1.1 and Smtp2 on IP 2.2.2.2 . which my spf record for the From ([email protected]) part in emails is :
spf1 include:mail.mydomain....
- 113
-1
votes
2
answers
75
views
E-mail reputation using our domain as the from sent by e-mail marketer
My boss wants to send a marketing e-mail to a large group of our customers. I personally feel that it's outside of our core business and don't support it, but that's about all I can do.
Normally the ...
- 139
2
votes
1
answer
2k
views
Postfix SMTP server gets "550 Requested mail action not taken: Invalid IP"
I have a SMTP server named smtp-ca.mdpi.com and when sending emails to some specific chinese email domains, I am getting back:
550 Requested mail action not taken: Invalid IP<64.15.147.140> (in ...
- 423
3
votes
2
answers
573
views
Is Sender Policy Framework (SPF) effective in preventing Phishing emails?
As defined in RFC4408, Sender Policy Framework only checks the envelope sender (aka MAIL FROM). The From: header is not being tested. As it is the value of the From: header which is usually displayed ...
- 4,405
85
votes
6
answers
122k
views
Do SPF Records For Primary Domain apply to subdomains?
I have a quick question regarding SPF records: Do they need to be present for all subdomains?
Lets say that I have a TXT record with SPF info for domain.com
Let's also say that I have a seperate ...
- 12.2k