All Questions
76
questions
2
votes
0
answers
53
views
SMTP Port 25 Issue on Nginx Mail Proxy
I set up an Nginx mail proxy server and configured it to distribute to several mail servers as a front-end server. However, I need to open port 25 in the configuration; otherwise, I cannot receive ...
- 21
0
votes
1
answer
326
views
How to use NGINX as legacy SMTP proxy to new SMTP system?
We have some very old radio equipment in the field which uses SMTP to notify us of failures. Unfortunately this equipment does not support modern SMTP authentication methods (SSL, etc), and can only ...
- 1,033
0
votes
2
answers
108
views
In Postfix, Should SSL FQDN Matches with myhostname or mydomain field in /etc/postfix/main.cf?
Quoted from the documentation:
myhostname
The internet hostname of this mail system. The default is to use the fully-qualified domain name (FQDN) from gethostname(), or to use the non-FQDN result ...
- 203
0
votes
1
answer
2k
views
Client is sending SMTP emails but they are not recorded in the "Sent" folder in webclients
I have been using instantly.ai to send emails. I connected IONOS.ca and JustHost.com mailboxes to instantly and it works fine (warmup, receiving and sending [yes other emails receive the emails sent, ...
0
votes
2
answers
418
views
How to send email on behalf of a customer, such that they handle replies?
Scenario: I have a customer A, who authorizes me / my software to send email on their behalf to their customers P, Q, etc.
Additionally, P, Q, etc. should see the email as coming from a.example.com.
...
0
votes
1
answer
3k
views
Postfix Recipient address rejected: Access denied error after removing permit_mynetworks
I have a mail server which have to remove "permit_mynetworks" from Postfix configuration file(main.cf) in case of abuse. I only set it to allow SASL autheniented relay. But now, postfix ...
0
votes
0
answers
228
views
.NET program sending of email not working on client server only
I've originally asked this in SO but it seems this is a more appropriate place.
Basically, I have a program that sends email which works on my local machine and on our company's server. However, it's ...
- 101
0
votes
1
answer
4k
views
SMTP authentication issues with Postfix Dovecot
I had bought a domain example.com and a VPS, and I used iRedMail to set up a mailserver.
Not wanting iRedMail to mess up with my Nginx, I decided to install Nginx and Roundcube by myself. However, it ...
- 25
1
vote
1
answer
812
views
nginx mail module always passing PLAIN method AUTH command to backend
I have implemented a nginx with mail module, and proxy to backend Hmail server. I realized no matter how I disable the auth-methods PLAIN. The nginx is just ignoring it.
How can I force to using ...
- 21
0
votes
1
answer
3k
views
How can I enable DKIM email verification on windows server 2019 for sending DKIM verified email via SMTP service?
I am sending activation and verification emails from my domain : https://www.monstermmorpg.com/
Recently I have moved to a new installation
The new server is : Windows Server 2019
How can I set a ...
- 576
0
votes
1
answer
3k
views
MS Exchange: How to enable SMTP to use OAUTH2.0 but with basic AUTH disabled
(I have asked this question also on stackoverflow but I now think that this might be a more useful community to ask hence I am also posting here.)
I am trying to know whether it is possible to enable ...
2
votes
1
answer
908
views
ICMP "Port Unreachable" when sending email
Since several months I have sporadic problems when I send emails.
With tcpdump I finally found out that I'm getting "Port unreachable" messages from what seems to be my email provider, ...
- 71
0
votes
1
answer
1k
views
SMTP Untrusted TLS connection still sending emails
When sending mail from my client through a mail server that is then using AWS SES as a mail relay I'm seeing this in the postfix log as each message moves through:
smtp: Untrusted TLS connection ...
- 579
1
vote
1
answer
9k
views
"535 5.7.8 Error: authentication failed: authentication failure" with postfix and dovecot sasl authentication
I'm testing remote smtp login on a server and keep getting 535 5.7.8 Error: authentication failed: authentication failure errors in the syslog and mail.log. Postfix is configured to use system user ...
- 562
0
votes
1
answer
296
views
Postfix encryption not available
EDIT #2
What's this error?
Aug 17 02:27:19 mail postfix/smtpd[1197]: lost connection after CONNECT from unknown[x.x.x.x]
Aug 17 02:27:19 mail postfix/smtpd[1197]: disconnect from unknown[x.x.x.x]
Aug ...
- 1