Questions tagged [spam]

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

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Provider for outgoing mail from own Postfix server

I've been running Postfix on my own dedicated server (hosted by Hetzner) for years, however, it's getting increasingly difficult get outgoing mail to Outlook/Hotmail and sometimes Google delivered. ...
svoop's user avatar
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2 votes
1 answer
915 views

DKIM Key Rotation Best Practices

Do you find it necessary to regenerate your DKIM keys every 1-6 months to avoid your mail going into the receiving servers' junk mail folder? Some guides recommend this, some even say it's "Best ...
Jeff's user avatar
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Suspicious Exchange message queues filling up disk space

So i came across my HD space getting full too quickly and after doing some inspecting with wireshark and powershell. It seems my email server is being used as a relay for spam. I closed port 25 on my ...
xR34P3Rx's user avatar
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Spam filtering based on average ascii score

I'm trying to come up with a new spam filter based on what has been coming through our filter lately. A lot of the messages have subject lines like: "Re: ᴢᴀɴᴛᴀᴄ 【ʜᴀs】 ʙᴇᴇɴ ʟɪɴᴋᴇᴅ 【ᴛo】 ᴄᴀɴᴄᴇʀ&...
Phalse Impressions's user avatar
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How to send an email on behalf of user

I have two zimbra mail servers, on server-1 I have one domain with accounts. I want to be allowed to send email from server2, on behalf of [email protected] that I dont have on server2, but this ...
madial9663's user avatar
1 vote
2 answers
99 views

Apache "ghost" requests?

I lack the ability to formulate my problem, otherwise I'd probably find the solution. I notice there are quite a number of pointless requests in my access log :~/$ cat /var/log/apache2/access.log | ...
php_nub_qq's user avatar
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How to address spam bounce on exceeded quota issue?

I'm investigating a mail server blacklist issue. Our mail server had a user over quota, which resulted in emails being bounced back to senders with a"user over quota" message. Some of these ...
Jérôme's user avatar
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Lots of exim4 notifcations due to failed sender verification

My exim4 server rejects a lot of spam emails due to failed sender verification. However, those result in lots of frozen messages, which in turn spam my postmaster inbox. Example line from exim log: ...
Arne's user avatar
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1 answer
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emails to Yahoo are ending up in SPAM folder despite spf=pass, dkim=pass and dmarc=pass

Are we possibility having a reputation problems with Yahoo emails? Yahoo raw mail header finds my policy I published: dmarc=success(p=REJECT,sp=REJECT) Emails to clients at Google and Outlook are not ...
MeSo2's user avatar
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Postfix seems to ignore spam miltering for LMTP

I use SpamAssassin through a milter to check e-mail, but it seems postfix does not check local delivery (like contact forms). How can I force Postfix to treat all mail as 'foreign'?
Guido Goluke's user avatar
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Cyren (Zxyel) classified my fresh website as a "Spam Site". I have never hosted a mail server. What now?

About a month ago I bought a cheap VPS from a popular provider, and also bought a new domain name for it. It hosts Nextcloud and TT-RSS, and I have never sent an email from it -- yet on http://...
D__'s user avatar
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2 votes
2 answers
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exim - Tainted filename for search - sender verify defer for failed to expand

discovered today this mailserver problem, and because have not written exim myself, can't debug it X-D also: is this normal? host zen.spamhaus.org ping zen.spamhaus.org ping: zen.spamhaus.org: No ...
user13226980's user avatar
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1 answer
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PTR recored Issue

We have 2 Mail servers ( Internal and External) the External is hosted by ISPA with ip address of 62.xxx.xxx.xxx, we use to have the internet from the same ISPA, and the PTR record is already setup. ...
Okok's user avatar
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How do I ensure that only my e-mail server is sending e-mail through my network?

This is a follow-up to Our IP was listed by Spamhaus - how can we prevent this from happening again? - unfortunately, it is happening yet again. I was thinking that people could have malware on their ...
Will Matheson's user avatar
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113 views

google apps domain gives diffrent servers when emailing out then mxtoolbox search shows

When I search a domain that uses google apps I get 10 results mx servers for the domain. similar to this alt1.aspmx.l.google.com alt2.aspmx.l.google.com when I recieve emails I get completly ...
user2630659's user avatar
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Yahoo Mail server constantly deferring mail from my server "due to user complaints"

I have a 100% no-spam score on mail tester. Have no problem with Gmail server, all users getting my emails. Have everything like SPF and other spam related criteria enabled. Yet, Yahoo mail server ...
thenondeveloper's user avatar
-1 votes
1 answer
191 views

Mail Server IP address is getting blocked by Spamhause

I have use my mail server public IP address for years. But now it is blocked by spamhause. But no special no illegal activities happened on my network. We have very good monitoring solutions and no ...
serverAdmin123's user avatar
-1 votes
1 answer
419 views

Ubuntu 16.04 Postfix works, but email goes to SPAM

Hello i follow this guide to install Postfix https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-18-04 and i added SPF, dmarc ...
lablnet's user avatar
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Exchange Online - List-Unsubscribe

I am trying to achieve having List-Unsubscribe header functionality for our marketing emails that are being sent using Distribution list. 3rd party mailing is a no-go. I have opened a case with M365 ...
Marek Kyzivát's user avatar
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1 answer
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Debian 10.4 / Exim 4.92 add incremental delay to the unsuccessful login attempt answer

Browsed over all the internet, but cannot find an answer. Is there any acl or something that I could apply to unsuccessful login attempt to add delay to it? As probably anyone running mx, I have a lot ...
BUKTOP's user avatar
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1 vote
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Why are my error logs full of 404s for "adult" content?

Idly perusing my site's error logs this morning, I was shocked to discover that a large number of rather explicit had been requested. (I don't mind telling you that I very nearly sprayed my cold brew ...
Tom Wright's user avatar
1 vote
1 answer
860 views

Setting up SPF record for A2Hosting shared hosting

I'm trying to setup A2Hosting SPF correctly since the proposed SPF is landing the emails in the SPAM folder in Gmail. This is the default SPF: v=spf1 +mx +a +ip4:210.125.99.77 ~all But when ...
Vlax's user avatar
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FreePBX / Asterisk: use inbound routes to block spammers/hackers

My FreePBX / Asterisk configuration was recently forced into allowing both anonymous inbound calls and SIP guests. So of course we're now getting blasted with spam/hack attempts. They show up in the ...
JimB's user avatar
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12 votes
2 answers
14k views

How does DKIM work when sending emails from multiple sources/servers?

So if I'm understanding DKIM correctly, it basically is a public/private key type of service. However, how does this work if you send emails from multiple servers/sources? For instance, I have a ...
Marc NJ's user avatar
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The DMARC test failed but we didn't find any obvious reason why

One of our users recently found out his emails are going to spam for some reason. This made me dive into everything and the last thing I can't seem to figure out is the Dmarc. We're using gmail for ...
Edan Ben-Atar's user avatar
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1 answer
183 views

Why are my Postfix mails recognized as Spam? [duplicate]

I have a Postfix mail that I have configured pretty good. mail-tester.com gives me a 10/10. I have tested on both Google and Yahoo, and checked their headers. Nothing seems to be wrong in the headers. ...
C. Keylan's user avatar
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3 answers
747 views

Is mail rejected by Exim's !verify = header_syntax ACL item, with RFC 2047-encoded From/To headers, legitimate?

A recent Exim upgrade added this to the default acl_smtp_data ACL: .ifndef NO_CHECK_DATA_VERIFY_HEADER_SYNTAX deny !acl = acl_local_deny_exceptions !verify = header_syntax message = header ...
Sam Morris's user avatar
1 vote
2 answers
377 views

Our IP was listed by Spamhaus - how can we prevent this from happening again?

I'm the technical assistant at a small-town public library where we run our own e-mail. If it matters, it's Postfix on an Ubuntu 18.04 box. Gateway / firewall is a 16.04 box with port forwarding set ...
Will Matheson's user avatar
0 votes
3 answers
160 views

Sharing IP black lists

Are there any tools similar to fail2ban that would allow sharing of IP black lists? What I'm looking for is something similar to a DNS based blackhole list or real-time blackhole list as is used to ...
Toddinpal's user avatar
  • 101
2 votes
0 answers
545 views

How to avoid gmail orange mark and spam filter when using cloudflare proxies?

I send emails from my site via php smtp method connected to 'smtp.gmail.com' on 465, and account added to GSuite. All my emails falls in spam folder in Gmail. The kind of emails is just password ...
Valik Tralik's user avatar
0 votes
1 answer
574 views

Find exim account sending lots of emails. (Spamming)

I have an Exim server with several domains configured. In each domain I have several email accounts. From time to time a computer configured with one of this emails gets infected and starts sending ...
FedeKrum's user avatar
  • 101
1 vote
1 answer
280 views

Spam Email Delivery and MX Records

I hope this is an appropriate post. We've had some sites on VPS's hit with a recent hack. The hacks were cleared up, the sites were set as "devious/dangerous" by Google were re-scanned by Google in ...
NDWest12's user avatar
3 votes
2 answers
2k views

SPAM Domain Spoofing through SES

A spammer seems to be running spam through SES and spoofing our domain. We are using SPF and DKIM so I’m not sure what is going on. This is our SPF record: v=spf1 a mx include:amazonses.com include:...
Collin Krawll's user avatar
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0 answers
91 views

Website Change causes Spam classification of emails

TL;DR: Emails containing a link to our company website are marked as Spam by different providers. How can I find the reason for this, and how can I stop it? Several weeks ago, the company that wrote ...
Tobias's user avatar
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4 votes
2 answers
14k views

Spam passing postfix config "hostname does not resolve to address: No address associated with hostname"

On a postfix MTA MX setup, I have a spam mail pass two checks which it definitely shouldn't. The postfix/smtpd process logs these warnings, which should be a hard fail in this setup: hostname * does ...
nyov's user avatar
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0 votes
2 answers
274 views

Emails from my domain (hmailserver) are always in YahooSpam

Hi during sending out my mails from my domain luxpost.com they are placed directly into spam folder in yahoo. I tried to analyse the raw header and got only DKIM warnings. So I placed a DKIM entry in ...
Robert's user avatar
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1 vote
1 answer
214 views

O365 Emails Getting Marked as Spam when Moved to new Folder

One of our main inbound mail accounts seems to be having a strange issue where the emails are getting marked as spam, not when they arrived, but when they are moved to a folder. They are also all ...
Sam K's user avatar
  • 506
1 vote
1 answer
701 views

Spamassasin rule to flag certain MX IPs

I've noticed a flood of spam that is related to the same range of IPs. All the spam email has different HTML text (which is english but meaningless) and a few embedded pictures (which I block) but ...
Jay M's user avatar
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0 votes
0 answers
218 views

Are email services looking at the "From address" along with the envelope sender when doing SPF lookups?

First, I understand the caveats and flaws of SPF as an aging authentication technology, and understand that it should be used in conjunction with DKIM and DMARC and is not a panacea for deliverability....
matthewlehew's user avatar
0 votes
1 answer
1k views

postfix server on VM - mail relay

I've setup a mail server according to this setup: https://thomas-leister.de/en/mailserver-debian-stretch/ The documentation itself looks quite good to me - is well explained and seems to work... ...
Alexander's user avatar
  • 111
1 vote
1 answer
1k views

how to reject emails with specific subject on Mail server postfix spamassassin?

I have postfix and spamassassin. recently I found an email with subject "XXX" to all company email addresses and aliases. So I was wondering if I can reject sending emails with specific subject "XXX" ...
Ahmed Reda's user avatar
0 votes
0 answers
151 views

Postfix forward mails to external domains as (inline) bounce

My problem: I own a postfix server with several Aliases on it. For example: [email protected] => [email protected] If I now send a email from [email protected] to [email protected] it get's forwarded to [email protected] ...
philipp's user avatar
  • 101
1 vote
0 answers
2k views

Linux history filled with priv_escl_start and _end after security changes

We are going through a process to make our linux servers more secure following a scan. I notice that on some of the machines, we now have lines like: LANG=C; printf "priv_escl_start_%s" "[random 8 ...
Johnny Doe's user avatar
0 votes
1 answer
109 views

Drop newsletter emails with Postfix

There is an option, i have seen in Fortimail, that makes you able to filter/drop all newsletter emails. I don't understand how Fortimail detects these type of emails. And I am keen to know whether ...
Zareh Kasparian's user avatar
6 votes
1 answer
2k views

Yahoo blocked emails after changing mail server public IP address

We have two exchange edge server and we want to change their public IP addresses. Changing one of the server IP addresses (and related DNS records) was done successfully and emails are delivered to ...
harsini's user avatar
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0 votes
0 answers
36 views

DKIM and SPF for Different Server [duplicate]

My situation like the following: Web server hosted in Google Cloud with domain name lets say: example.com Mail server hosted in Linode (lets say in server name: server.myserver.com) using cPanel with ...
Luxor's user avatar
  • 1
0 votes
1 answer
105 views

Mailserver sufficient to pass as non-spam with Gmail

I am coming to the point of thinking this is beyond my ability to accomplish. I have repeatedly built new servers on Digital Ocean (3 so far) with Postfix, Dovecot, DKIM, pretty much everything out ...
Oliver Williams's user avatar
0 votes
1 answer
1k views

How to cut-off spam (postfix+amavis-new)

I'm using postfix+dovecot+amavis-new+clamav+spamassassin+postgrey on my Ubuntu based VPS. Since some days i'm receiving a lot of spam, with a low level of spam score in headers. Common for all spam ...
msc3's user avatar
  • 1
0 votes
0 answers
20 views

Email piping through to Junk folder

I have a personal business email that I know sometimes pipes to junk, even if I've shared correspondence previously with the recipient. I'm doing all I can to fix this but in the meantime I've set up ...
Mark's user avatar
  • 1
5 votes
2 answers
1k views

Postfix: ACCEPT if RBL and SPF checks pass, DUNNO/greylist otherwise. How to do it?

I would like to accept all clients that pass RBL and SPF checks (and possibly some checks, but these are minimum requirements for me), and greylist those who don't. When a client passes the SPF check (...
michau's user avatar
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