Linked Questions

0 votes
1 answer
2k views

spamhaus.org is blocking our IP because we use multiple unrelated HELO values

spamhaus.org is blocking our IP because we send mail using multiples domain names from a single IP. The message is A device (computer, server, mobile phone, etc), or an app on a device that is using ...
77 votes
5 answers
109k views

Is Postfix the same thing as Sendmail?

I have Postfix setup on my server so that I can send outgoing mail using the command-line: mail -s "Subject" [email protected] Is this using Sendmail or Postfix ? Is "Sendmail" just a software ...
4 votes
2 answers
3k views

When DKIM is installed, will I still be able to send email for my domain from gmail?

Let's say I own example.com, that I install and configure dkim on my server (apt-get install opendkim opendkim-tools, etc.), and that I add the relevant public key to the domain's DNS records. Then ...
42 votes
7 answers
3k views

Is it becoming impossible to be a small mail provider?

I operate a small mail server for my private emails, some friends who have websites and two NGOs. In total my server sends between 60 and 400 messages a day. Now a lot of these emails are personal ...
2 votes
2 answers
4k views

Gmail is blocking email from my IP

I've had a virtual private server for close to 6 months, and I'm going to start sending emails to users from [email protected]. My handful of email tests so far have all resulted in a bounce ...
1 vote
1 answer
293 views

How to minimize chances of one's domain being falsely blacklisted (uribl)

My side job is to admin my wife's company domain. It's only used as a domain name for Google mail and tools (slides, docs, etc...). Although she used her domain for email for many years without any ...
0 votes
1 answer
33 views

procedure/protocol for ensuring the decency of a new IP address

According to the comments on is it possible to get a bad IP address when setting up a new VPS? one can't assume that a new VPS IP address is decent. So how do I ensure (before I start installing ...
0 votes
1 answer
1k views

AWS SES emails going to spam

I have a domain on name.com and the website is hosted on AWS Lightsail. I have set up SES service for the emails. I am doing a curl request to my domain to send an email from the email server which is ...
3 votes
1 answer
6k views

Is it a DMARC failure if disposition=none & dkim=fail?

When I get one of these DMARC reports from Google is it because there is a problem? Or is it standard protocol. I am curious because I sent one test email and got this DMARC report to abuse@...
0 votes
1 answer
184 views

Why are my Postfix mails recognized as Spam? [duplicate]

I have a Postfix mail that I have configured pretty good. mail-tester.com gives me a 10/10. I have tested on both Google and Yahoo, and checked their headers. Nothing seems to be wrong in the headers. ...
0 votes
0 answers
36 views

DKIM and SPF for Different Server [duplicate]

My situation like the following: Web server hosted in Google Cloud with domain name lets say: example.com Mail server hosted in Linode (lets say in server name: server.myserver.com) using cPanel with ...
1 vote
0 answers
49 views

Postfix GMail bouncing with "very low reputation of sending IP" [duplicate]

i'm using a Debian 9 with Postfix and i've got issues with my mails sending to google mail. After sending a mail, i will instantly get a response: "Undelivered Mail Returned to Sender". Our System ...
1 vote
1 answer
490 views

Emails going to spam even though DKIM and SPF records set up and rDNS too in EC2. I am usinf postfix and dovecot [duplicate]

I have set up my own email server in AWS using postfix and dovecot. I have also set up DKIP and SPF and DMARC records. Now the problem is when i send an email from [email protected], its not flagged ...
3 votes
2 answers
3k views

Email from sendgrid are going to spam, spf & dkim pass & spamfilter itself says it isn't spam

At my work we use Sendgrid to send automatic e-mails to the users of our platform. Since a couple of days the e-mails are going to spam on hotmail.com & outlook.com. This is weird because the DNS ...
8 votes
1 answer
658 views

How to deal with Microsoft and Google agressive spam policies?

Introduction: I have run my own mail server for more than 10 years, and I never had any problem with Gmail, so far. But I needed to complain regularly (like every year) to Hotmail, because they were ...

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