All Questions
110
questions
-1
votes
1
answer
692
views
What could be causing PowerMTA not to forward emails over port 465 SSL...?
We have a PowerMTA server that receives incoming e-mail. and forward it to external SMTP server that's not running PowerMTA i tried to do it using port 587 and port 25 both working fine and emails ...
0
votes
1
answer
728
views
Postfix : "Connection timed out" on all outbound email
Aug 25 12:56:20 mail postfix/pickup[375941]: ACF7F200E248: uid=0 from=<root>
Aug 25 12:56:20 mail postfix/cleanup[376172]: ACF7F200E248: message-id=<20210825125620.ACF7F200E248@mail....
- 33
0
votes
1
answer
39
views
My SMTP server transferring out Terabytes of data in a day [duplicate]
We are having an issue with one of our SMTP servers. Problem arises since 3 weeks and is transferring out terabytes of data in a day.
Any Idea why is this happening, or suggestion to dig out & ...
- 9
1
vote
1
answer
3k
views
IMAP and SMTP Still use Self Signed SSL even I have issued a Mail Server SSL in Cyberpanel
I using cyberpanel on CentOS 7 and I setup SSL for my postfix and dovecot. But I still got "SSL Invalid" caused the self-signed SSL even I have configure SSL using Lets Encrypt.
This is /etc/...
- 21
0
votes
1
answer
58
views
Postfix - How to receive mails from one or a few Hosts only and disabling open relay or local domain
I would Postfix to receive mail from my front antispam server host.
Postfix does not act as open relay but if mails are sent to local domain, mails are delivered and this must be blocked.
So goal is:
...
- 1
0
votes
0
answers
439
views
postfix smtp slow to send from clients (and sometimes does not authenticate), works fine with 'squirrelmail'?
I inherited a long time working postfix with courier imap box that runs run of the mill smtp. It seems to use fail2ban for firewall protection of some sort (never used fail2ban) and according to /var/...
- 157
0
votes
0
answers
295
views
I tried postfix restart, said service isn't running. Yet I am on my working mail server? (cent os)
So I am not sure what I am doing wrong. This all started with the need to let others from outside our network access the SMTP to send email from offsite.
So I had in /etc/postfix a check_clients ...
- 157
0
votes
1
answer
2k
views
Exim + Dovecot sending or receiving an email occurs the error: Unknown user
I'm running a mail server with CentOS 7 + Exim 4.92 + Dovecot 2.2.36 and RoundCubeMail as web interface, and have the following problem: when I send to or receive from emails which is not admin@ or ...
- 41
0
votes
1
answer
58
views
SMTP DKIM for 1 add-on domain on 2 servers
Is there a more practical way for SMTP DKIM signing for a VPS server that has a parked domain but does not host the content other than private key copying?
I have looked all over Server Fault but ...
0
votes
1
answer
340
views
Sendmail is not working to when external IP is trying to connect
I have CentOS with following for sendmail
DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
Where i need a remote location device to send SMTP mail. But the remote location always getting Connection refused
...
- 265
1
vote
0
answers
741
views
Connect / disconnect unknown postfix log
I'm checking the logs and i found these lines in maillog
postfix/smtpd[12135]: warning: hostname mta9.imxonlines.co.za does not resolve to address 91.212.150.89: Name or service not known
connect ...
- 41
0
votes
0
answers
347
views
Can we use nginx proxy to hide origin server exposure from external smtp like gmail?
So if possible, I'd like to hide the exposure of my origin server ip when sending SMTP emails for example from Gmail because I have been DDoSed several times just because they get IP from email.
I ...
- 101
1
vote
1
answer
8k
views
Connection closed by foreign host (postfix)
Tried to test my smtp server (centos server), I am using telet at centos
When I tried to test using code:
telnet 127.0.0.1 25
Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'.
...
1
vote
0
answers
674
views
Where does sendmail get its user authentication information?
I set up a new remote CentOS email server using sendmail and dovecot. I am able to receive mail into mailboxes but can not use SMTP to send.
Trying to login by hand using
# telnet mail.steelydev....
- 11
2
votes
0
answers
534
views
Postfix transport based on source IP address (with or without relayhost)
We have Postfix relay server running on centOS 7.4.
Restricted source IP address by mynetworks cidr
mynetworks = cidr:/etc/postfix/allowlist.cidr
Now, I like to configure, some of the source ip ...
- 127