All Questions
Tagged with spam-prevention postfix
26
questions
9
votes
2
answers
3k
views
How do I enable DKIM for bounce messages in Postfix
I have set up a linux email server with Postfix and have correctly set up SPF and DKIM. When I send an email, the email is signed properly, and when I view the source from the receiving client (such ...
- 628
3
votes
1
answer
5k
views
Mail forwarding: Do I need to concern myself with the SPF fail header from Google?
I'm using a Postfix mail server to forward personal mails from an EC2
instance to a Gmail account.
To prevent Google from considdering me a source of spam I have set up
all the ...
- 133
3
votes
1
answer
2k
views
Securing smtp with login
I have a ispconfig server, and it seems that someone is using it to send spam. I got about 130 "Mail Delivery System" emails about declined send email.
This spammer uses my email address as sent from ...
- 209
1
vote
2
answers
722
views
Am I an Open Mail relay? Cent OS with Postfix, Dovecot,
After some time I build up an E-Mail Server again. I looked up different tutorial to do it right. I did it right or at least I can send and receive E-Mails.
The most important thing for me is that ...
- 21
1
vote
1
answer
1k
views
Postfix is Sending Spam [closed]
I have an Ubuntu 12.04 server, hosted on AWS, that powers a dozen WordPress installations using Nginx and php5-fpm.
The problem just began one day. My server was down. Panic! Whenever I turned it on ...
- 474
1
vote
1
answer
663
views
postfix: block mails to a specific and non existent mail address
How could I block mail to an incoming address that spammers are hammering via postfix? I have a webmin interface to postfix, so if this can be done via webmin interface that would be great.
- 1,129
1
vote
0
answers
26
views
How to prioritise one domain name over others in rDNS?
I have a single remote server and multiple domain names. This server hosts webpages under certain domain names - say domain1.com - and hosts a webpage with an associated mail server under a separate ...
- 33
1
vote
0
answers
106
views
Debian server getting spammed through
This server has been live for many years, however, recently it is under attack by spam.
I have not been able to plug the hole they are using. It seems that the spam is using the sasl_username=clamav.
...
- 11
1
vote
0
answers
450
views
header_checks is applied to mail body (CentOS 7 + Postfix 2.10.1)
I have received SPAM e-mail, added regular expression to header_checks about it and when tried to forward SPAM e-mail as attachment, then this check triggered and rejected my forwarded e-mail.
Regexp ...
- 317
1
vote
0
answers
133
views
Postfix is forwarding/relaying spam
I have an Ubuntu 16.04 machine with Postfix 3.1.0 and virtual mailboxes (iredmail).
I'm using postscreen (with a local Bind server), Amavis with ClamAV and SpamAssassin.
The amount of received spam ...
- 11
1
vote
0
answers
298
views
Gmail detecting mails as spam [Postfix]
I am running an ispconfig web/mail server and the problem is that my mail ends up in spam at google. I have everything set up rDNS, DKIM, SPF, dmarc, so i dont think that the record part would be an ...
- 121
1
vote
0
answers
795
views
Tracing which user/process is sending mail to local postfix instance via TCP
I have a server, running postfix MTA. There is currently a spam issue. It seems one of the local users got some infected software/script/binary, that is connecting to the postfix via TCP port 25 ...
- 11
1
vote
0
answers
1k
views
How to bounce an email
I'm getting spam (thanks to NameCheap not properly cloaking my email address), and I'd like to bounce the emails back to the spammers so they think my account doesn't exist. They're not forged From ...
- 183
1
vote
0
answers
476
views
Configure Ubuntu Server VPS to send mail without going to spam
I have installed and configured Postfix on a VPS.
I have managed to get it so I can send and receive mail.
However every time I send mail from It, it get's marked as spam and was wondering how I ...
- 111
0
votes
2
answers
246
views
what's the difference between using RBLs and anti-spam software?
My doubt is, is it too different to use RBLs instead of anti-spam programs? (like SpamAssassin)
I've a Postfix + Dovecot server with some RBLs in Postfix, and disabled SpamAssassin because it was ...
- 277