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 ...
- 13
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
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 ...
- 1
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 ...
- 277
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
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 ...
- 11
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
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://...
- 161
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
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 ...
- 51
0
votes
1
answer
47
views
Avoiding Mail Server Inconvenience
We run our own web server (Apache on Ubuntu) for a bunch of non-commercial websites, but there was no mail transfer agent installed on it, since they are complex to configure and maintain. You need to ...
- 814
0
votes
0
answers
736
views
Detect spambot on ubuntu 12 TLS
Recently I discovered in my mail log that there is an enormous amount of spam being sent from my home server. I am running no websites, just zpanel. I closed down all the ports and am monitoring the ...
- 1,021
0
votes
1
answer
662
views
Strange emails in postfix queue
Currently I am not sending any emails, I have postfix and dovecot installed but in the in the postfix mail queue I see strange emails almost every minute, i dont know from where is this spam ...
- 252
0
votes
0
answers
169
views
Local SMTP Server — prevent spam flag?
I opened up port 25 on my router, so now I can use sendmail to send email.
However, the emails I send are being marked as spam by my personal gmail account (understandably). The "from" field defaults ...
- 273
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
0
votes
1
answer
125
views
DKIM configuration on Debian
Due to the fact that many e-mails we send with our company address do not get delivered, rejected or marked as spam, I searched for a solution on the web.
One of the solutions I found was to use DKIM ...
- 279
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
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
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
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