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Server Fault Stack Exchange

Questions tagged [spam]

Unsolicited e-mail, comments or posts, often sent out in large volumes; possibly but not necessarily commercial in nature

Spam can refer to:

  • Junk e-mail
  • Unwanted posts on a website
  • Unwanted comments on a post on a website
  • A large number of posts designed to crash a system rather than provide useful content

For our canonical Q&A about how to prevent email you send from being flagged as spam, see How to send emails and avoid them being classified as spam?.

1396 questions
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How can I reject spam before reaching SMTP on Postfix

My server has started receiving thousands of attempts to use my mail server to send spam from dynamic.hinet.net. The attempts are always rejected, but it's non-stop. I'd like to block these attempts before they even reach the mail server is…
nutman
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Add a second IP to SPF record, from an external SMTP server

I would like to add the IP of an external SMTP server to an existing SPF record, which is looks like this: "v=spf1 a mx ip4:185.6.139.6 a:frey.mailpool.1.netmask.hu a:frey.mailpool.2.netmask.hu a:frey.mailpool.3.netmask.hu ~all" Isn't will it mess…
Domi Szécskai
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1 answer

How to improve spam protection using postfix?

I try to improve the spam protection of my postfix install for several weeks now, but I still receive spam. What I've done so far: Added SpamAssassin Added SPF record Tuned rejection rules Now I'm stuck and have no clue what else I could do.…
Marco Betschart
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2 answers

Disable php scripts from sending mails

My question is regarding preventing php scripts from sending mail. It has been marked a duplicate of another more general question about server security but that's not what this question is about. After a long and bitter fight against hackerspammers…
hazymat
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2 answers

Is this someone trying to hack the server?

I keep seeing the following coming up in my nginx and Apache server log files as a 400: () { :; }; /bin/ping -c 3 x.x.x.x x.x.x.x is different IPs. Does this look like a hacker trying to find a hole into the server? We have IP blocking facilities,…
Andrew Newby
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Exchange 2013 Receive Connector Scoping and Open Relay

I have an Exchange 2013 server which was a victim of spam infiltration, and the exchange server was being used as an open relay for unauthorized users (and domains) to remotely send spam. I have done research and was unable to find any detailed…
Kevin
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Block outgoing emails from Postfix from non-existent users

I'm getting spam sent through my server. The sender names are always random, but always in the form randomname@mydomain.com. I've tried adding reject_unlisted_senders to the smtpd_sender_restrictions directive, but it doesn't work -- the emails are…
Jeremy Warne
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1 answer

Spam sent from my domain after a Wordpress exploit

I have 2 domains on my dedicated server running debian. One of them is linked to a wordpress site, mydomain.com. I've noticed that on both my sites, lately, the performances were horrible so I started to look for a reason. I noticed that in the last…
Jay Zus
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Mail being marked as spam by gmail but only from certain addresses

I am sending the same message through the PHP mail() function using two different addresses in the header. When I send the email with contact@domain.com it is marked as spam by gmail but when I send the exact same email with admin@domain.com it goes…
blazerunner44
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1 answer

My server mail going junk in hotmail and yahoo

All my server mails going to spam in hotmail and yahoo. Here is my full mail source. Can any one please help me to sort out this issue…
Karthi
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1 answer

Automated email sent using Bash mail function gets filtered as spam by Gmail

I have a Bash script which is scheduled to run everyday and sends out user notification emails using a command like: mail -s "Hello World" someone@gmail.com Why is this email detected as spam by Gmail. Is there something I can do so that Gmail…
user276981
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8 answers

Remove blacklist from spamRATS

I have checked my IP in SpamRATS and the result is the following: Standards Compliance: Does IP Address resolve to a reverse hostname... Passed! Does IP Address comply with reverse hostname naming convention...Passed! List Status: RATS-Dyna - On…
Alex
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2 answers

Postfix, I'm receiving a lot of undelivered mails (logs inside)

Some days I receive a lot of Undelivered emails, it's like my server is used as relay. But I don't know if that's only backscatter emails or my server is really used as a relay. Here is what I found in my logs : Feb 25 14:25:22 web…
Abdessamad
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How can I avoid being classified as spammer when I forward mail to a gmail account?

Update: The link pointed to by the "duplicate" initially didn't seem like the same problem to me, because the post talked about blacklisted "domains" not blacklisted "IP addresses." However the main solution is the same: If you are going to forward…
Jon Watte
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What Does 'HELO_LH_HOME' Means In Spamassassin's result?

I'm trying to send emails from PHPMailer using php on my IIS server. But My emails are going to spam, So I've used spamassasin to detect what is wrong? and here is the result: pts rule name description ---- ----------------------…
Vedant Terkar
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