All Questions
Tagged with spam-prevention postfix
26
questions
0
votes
0
answers
98
views
Postfix: check sender IP but don't reject
I need to do the following with Postfix: when receiving mail from remote server, check sender IP with various blacklisting services (e.g. spamhaus or abuseipdb), but avoid rejecting mail automatically,...
- 101
0
votes
0
answers
136
views
Multiple Domains, Single IP Blocked by Gmail
I have two domain names and 1 email server.
When I send an email from my server to my gmail account, and then view the original message, emails from both domains are stated to:
Pass SPF
Pass DKIM
...
- 33
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
0
votes
1
answer
172
views
My emails are seen as spam by Gmail
I have a email server with postfix, dovecot, spamassassin, etc.
www.mail-tester.com gives me 10/10.
www.spamscore.net complains about the spf (SPF record SOFTFAIL) and reverse DNS: I have neither ...
- 465k
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
0
votes
2
answers
4k
views
How do I block Postfix from sending spam?
My postfix is sending spam from a [email protected] address. How is this possible and how do I allow only www-data@localhost to send and postfix to only deliver from [email protected] to ...
CommunityBot
- 1
0
votes
1
answer
183
views
unauthorized access to dovecot services
Recently i was enable mail-relay to 3rd party tool, suddenly i found 1000 of emails are going as a spam everyday to unknown users i disable the mail-relay ,but still we facing some one login our ...
- 3,284
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
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 ...
- 918
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
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 ...
- 1,530
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
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 ...
- 159k
0
votes
1
answer
76
views
Mails to Microsoft's servers rejected
When I send an email to any Microsoft address it's instantly rejected.
Searching for a while I find that only MS servers blacklist my IP, and I need to go to JMRP and ask them to remove it: https://...
