The server configuration of email, including POP3, SMTP, IMAP, and popular server software packages that control email.

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62 views

How reliable is validating email domain by reverse DNS MX record checking [duplicate]

This question is not about how to protect against spam or validate a particular email user. But how reliable is validating emails domain (does it exists at all) by reverse dns. What are the pitfalls ...
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2answers
104 views

Emails going to spam - Gmail / Hotmail / Outlook? [duplicate]

Right, sorry if I come across a frustrated but I'm actually raged that I haven't got this sorted yet. We moved to a dedicated server 2 months ago, from a shared server (which had no issues with ...
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2answers
32 views

Is it possible to recover emails sent from SMTP?

So basically I have a contact form on my site. I just realized that the contact form didn't forward responses to my email because I didn't have sendmail installed. Is there any way for me to recover ...
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0answers
61 views

Manual autodiscover implementation failing. Why?

I am managing a mail server, and would like to have my Outlook users be able to automatically set up their mail server information. Normally this is done with an autodiscover file. Here's how I ...
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1answer
42 views

Spam from my email address on my domain with DKIM

Someone is sending spam emails from my email address. And it looks like these emails have DKIM. How is this can be possible if they doesn't have access to that email? (my emails handles by something ...
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1answer
134 views

Outgoing mail fails to be received by Gmail. Rejected because PTR record does not mach forward lookup

My mail server has been sending mail with no rejections from gmail until recently. No changes have been made that I am aware of. Recently my outgoing messages are failing with an error about a ...
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0answers
19 views

Email delivery status

I am trying to track an email. I use mutt so that I can edit the email headers directly before sending, and I added: X-Confirm-Reading-To: me@email Disposition-Notification-To: me@email ...
0
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1answer
62 views

PHP mail with domain in body

Running the following code snippet does not work. The email is never received. Note that I am using dummy values for email and domain. $to = "email@domain.com"; $subject = 'Mail Test'; $headers = ...
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2answers
48 views

How do IPs end up on the spam blacklists

I don't know if this is the right place to ask this kind of question but here goes. I have 3 IPs on my server, which I'm running for shared hosting. The main shared IP gets blacklisted sometimes, ...
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2answers
31 views

Using POP3 and IMAP for same account

When using a mailserver I know that IMAP leaves all the mail in the server while pop3 downloads it and deletes it (sometimes after a few days, depending on the mail client configuration options). My ...
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0answers
20 views

Postfix sending limitation

I am a complete newbie in server-administration, but with this new work I am actually the system admin. So, first of all, I am kinda sorry for my poor property of language - but I am actually a web ...
0
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2answers
97 views

Google Cloud Server Email Forwarding

I have a google cloud server with Cloud DNS working for my domain and IIS hosted website. I need email for my domain to be forwarded, i.e. for john@myCloudServerDomain.com yo go to my existing ...
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1answer
30 views

Should we rename the host name part of the email files when migrating to another email server?

The original email file name pattern looks like this: 1447902202.31829.old-domain.com,S=15459960_2,S If we are going to migrate to another email server, should we rename the host name part of the ...
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1answer
35 views

How to prevent spammers sending bogus@mydomain emails out of my name [duplicate]

Lately I receive a lot of Delivery Status Notification (Failure) e-mails. Bogus spam email is sent from blablaxx@mydomain to other emailadresses, and bounce back to my catch-all info@mydomain with ...
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0answers
24 views

SMTP server for Python parser

I'm trying to get emails into a Python application. There is an exchange server that marks some emails with a BCC address for archive@somedomain.com. I do not control the Exchange server. The email ...
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2answers
129 views

Sendmail and Gmail

I'm trying to send email with sendmail. I followed this how-to: http://linuxconfig.org/configuring-gmail-as-sendmail-email-relay I tried to send the email over console: echo "Just testing my ...
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0answers
20 views

Outgoing SPAM Protection for vps

We are providing VPS servers (both openvz and kvm) on Proxmox VE cluster. Recently, we have attracted a large number of spammers. While we manage to block the openvz ones by monitoring the number of ...
1
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1answer
113 views

GMail moves Exim4 emails into Spam

I am trying to setup email transfer to GMail. This bash command in OS Debian: echo "aaa" | mailx -r "xxxxx@xxxxx.xxx" -s"sdf" xxxxx.xxxxxxx@gmail.com But all of my messages GMail moves into Spam. ...
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1answer
24 views

Postfix rejecting inbound mail to virtual mailboxes

I followed this tutorial to setup an email server that uses virtual users. https://www.rosehosting.com/blog/mailserver-with-virtual-users-and-domains-using-postfix-and-dovecot-on-a-centos-6-vps/ I am ...
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1answer
29 views

bind9.10 dnssec inline signing failing

I am pretty sure the ultimate error is this: [\u@r2d2:/home/ex-mailer-domains/domain.com] # dig domain.com +dnssec @8.8.8.8 ; <<>> DiG 9.10.3 <<>> domain.com +dnssec @8.8.8.8 ...
3
votes
2answers
35 views

Are Windows internal CA-issued certificates compatible with Mac clients?

I am looking into deploying an internal CA to replace the GlobalSign certificates we use for our internal email encryption: Internal CA would be set up using ADCS in a two-tier hierarchy, no other ...
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0answers
31 views

postfix whitelist all incoming mail with a specific domain destination

Would it be possible to whitelist all incoming mails with a specific recipient domain. I have multiple domains running on my mailserver. I want to simply push thru all the incoming mails with a ...
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0answers
16 views

Blacklist server [duplicate]

I have a problem with one blacklist server: Subject: Undelivered Mail Returned to Sender This is the mail system at host xx.xxxxx.sk. I'm sorry to have to inform you that your message ...
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0answers
61 views

Unable to use Exim with Exchange/Office 365 - Smart Host

I have been struggling with getting Exim and Office 365 to play nice together and am hoping for some insight. Here's my setup: All mail for domain.com gets sent to my Office 365 Exchange server, it ...
3
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2answers
321 views

Moving to Exchange 2016 while keeping Exchange 2010 as primary relay

Here's our current setup: - Firewall with SMTP proxy, scans incoming/outgoing mail and forwards to Exchange2010 server - Internal Exchange 2010 server (SP3 RU11), running Sophos PureMessage as ...
2
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1answer
57 views

Emails are being delivered as spam to Gmail? [duplicate]

for the last 6 weeks (yes, that long) I've been struggling to successfully deliver emails to Gmail accounts. For some reason, every single email that is sent from our domain is flagged as spam by ...
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1answer
70 views

Sendmail works fine but PHP is unable to use that

I have a problem sending mail with PHP on a LAMP (redhat 7 server). I have configured sendmail, with which I am able to send email using the following: $ sendmail toemail@something.com <press ...
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0answers
225 views

Outlook.com rejects: 550 SC-001 (BAY004-MC5F13)

I am operating a cluster of 3 dedicated machines for a webapp, each of those uses sendmail as MTA. Hostnames are node1.domain.com node2.domain.com node3.domain.com Unfortunatelly outlook.com rejects ...
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1answer
27 views

What informations can be retrieved about a mail that was not delivered?

During the migration from our old mail server to Zimbra 8.6, we created a number of Distribution Lists, however, for some reason (our fault probably), one of those list which was supposed to hold 4 ...
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1answer
22 views

Host for Dedicated Box blocks Port 25, can I still email directly off the server using Port 26?

I have a server that I want to send email off of directly. Host is blocking Port 25. They have told me to go to WHM -> Service manager -> exim on another port (Set to 26) Is this actually a solution? ...
-1
votes
1answer
134 views

DKIM signature and domainkeys failing [closed]

I'm trying to setup DKIM for my server but there seems to be some problem with the DNS. I am using a windows server and plesk for the administration, my mail server is MailEnable standard and for my ...
0
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1answer
342 views

Graylog How do I include message data in alert email?

I am having trouble adding relevant information to the alert emails sent from Graylog. I would like to include the actual log message that generated the email alert in the actual email alert. I am ...
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1answer
22 views

Email forwarding issue

I have a website at classicalmusiccity.com. We have emails tied to that domain that forward to a gmail account. Everything has been fine and dandy until a couple days ago. No one can send an email to ...
1
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1answer
48 views

It's OK to only have SMTP for server-to-server communication?

I'm configuring an antispam appliance to filter mail traffic coming to our Exchange server. The flow will be something like this: ...
0
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0answers
48 views

ispconfig can't redirect mail to a gmail account due “Connection timed out”

I'm running ispconfig with the next configuration: Servidor: (Ubuntu 14.04.2 LTS (Trusty Tahr)) ISPConfig 3.0.5.4p5 I'm redirecting mail to a gmail account with the command: redirect ...
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1answer
24 views

munin - critical item mailqueue

I have just installed a new Debian Jessie server.. In munin monitoring there is 1 critical item: Mailqueue What is that? Haven't installed any mail service/server
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3answers
42 views

How can I stop ingress spoofed email to my company

I am receiving spoofed emails to my private company address, for example from HP, IBM, RSA and ISACA, but these are not actually from those companies. How can I stop these kind of emails coming into ...
0
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1answer
42 views

iRedAdmin SMTP sending error

Recently i installed iredadmin on Debian. Then i tried to send mail using laravel framework with SMTP settings, but i cant get the email. This is my mail error log: Nov 26 10:19:43 server ...
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1answer
21 views

Exchange Server - automatically change an address from the To field to the BCC

We have an ALL distribution list (DL), which obviously includes all of our users. Sometimes, when someone is sending an email to ALL, a thread begins which includes the ALL DL. We don't like it. W'd ...
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0answers
24 views

Setting DKIM and SPF records for client domains

I have created an email server that is capable of handling mail for multiple websites. e.g. tom@website1.com, tom@website2.com etc. The emails are sending and receiving fine, but the spam score is ...
1
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1answer
106 views

sending emails fails with gmail only

My debian server sends email to yahoo, hotmail but not to gmail ! tail /etc/log/mail.log 95.211.117.206], dsn=4.0.0, stat=Deferred: Connection timed out with 75gmail.com. Nov 23 23:07:52 sitechat ...
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2answers
79 views

Multiple MX or Round-Robin A Record

Which is Better, and Why? There are 2 inbound mail filters, they are in a cluster with equal hardware specs and can handle the same load. This is a new configuration and I would like to know which ...
0
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1answer
29 views

How to troubleshoot emails from some hosts not being received without error messages

I am trying to troubleshoot the server I mantain. It is a Centos 6.6 with Plesk 12.0.18, it uses Qmail and Courier as email services from what I can see. Now in general all emails work succesfully ...
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0answers
25 views

How to send a lot of emails without tripping the alarms

I need to send couple of thousand emails at once, all addresses are existing users of one domain. I was wondering if that would not cause receiving server to cry 'Spam!' at the sight of so many ...
0
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1answer
85 views

Postfix Server for Mass Mailing on Multiple Domains

I'm currently setting up a mail server for mass mailing on a non-profit. I decided to go with Postfix since I had some experience with the configuration. However my experience was for multi domain ...
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1answer
58 views

Format for/creation of PTR and SPF records?

Let's say that I have a server that resides at Linode that I use for my business, mybusiness.com. It has an IP Address of 1.2.3.4, and an A record of myserver.mybusiness.com. I own the domain name ...
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3answers
66 views

FCrDNS With Separate Host and Mail Server

I have an "A" record on my DNS which points to an IP, specifically the IP my website is hosted on. I use a separate IP for my email server. This causes my emails to fail the Forward Confirmed Reverse ...
10
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2answers
494 views

crontab sends month-old emails

ubuntu 14.04 Mailserver: Postfix root receives dozen of emails from crontab. These mails contain PHP warnings. I've fixed the cause for these warnings. I've fixed every cronjobs to not send emails ...
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1answer
61 views

Email Exchange and Cloudflare [closed]

i would like to offer Mail Accounts without giving the real server Adress to the public (I'm using Cloudflare). Currently i use a e-mail-Relay to send messages, the harder problem is to receive ...
1
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0answers
61 views

Postfix cannot start but dovecot is ok

My postfix service cannot start. Here is message: Job for postfix.service failed. See 'systemctl status postfix.service' and 'journalctl -xn' for details. And here is service status: ...