Newest smtp Questions

Q&A for system and network administrators

Server to server connection won't use TLS but SMTPD will

I'm trying to get my email server to encrypt the connection between my email server and others. It currently can connect via TLS to itself but it doesn't seem to be able to connect to other servers ...

SMTP issues with AWS Linux Server

I have little experience with SMTPs and have come across some trouble getting my Drupal site to send out emails. The only change that had been made prior to the error was adding a CloudFront to ...

Rundeck mail config issue

i configured my Rundeck's mail settings, but i still got this message: 2017-02-23 10:54:06,796 [quartzScheduler_Worker-1] ERROR grails.app.services.rundeck.services.NotificationService - Error ...

Postfix - fatal: need service transport:endpoint instead of “reject_unauth_destination”

Hello I am having trouble sending and receiving emails. I have googled for the error but all the results talk about "inet" instead of my error "reject_unauth_destination". I dont know if this is a ...

What is the simplest way to setup cron to send emails in ubuntu 16.04? Current approach (detailed in post) is not working

My understanding is that: sSMTP has to be installed and configured MAILTO= has to be added on top of crontab I have setup also installed the following instructions: https://wiki.archlinux.org/index....

Sending mail (via java) is working in eclipse but not in linux server

I am using java code to send a mail using smtp.gmail.com as smtp host. This code was working fine. But after a firewall upgrade in linux, its started to throw this error everytime I try to send mail. ...

Postfix Log - See who tries to send Mails with others peoples names

I have some minor problems I want to solve regarding postfix. Errors of this kind pop up periodically (1-5 times a day): Feb 1 14:11:37 mail postfix/submission/smtpd[27435]: connect from ...

What's the point of an SMTP session size limit?

As a receiving SMTP server, a maximum message size makes sense. A huge message takes up space after it is received. A full disk makes users unhappy. A maximum number of messages per sender in a fixed ...

Is there a way to test a SSL certificate for a SMTP server?

A couple of months ago, my company bought a Rapid SSL Certificate which supports until 256-bits cryptography and which is used both for communication between our mobile apps and our server and to send ...

Windows 7 is blocking telnet 25 [migrated]

When I use command telnet <myhost.com> 25 from my home PC running Windows 7 it does not connect with message "Could not open connection to the host, on port 25: Connect failed." On the 587 port ...

What's the point of repeating an email address in “The Envelope” and the “The Header”?

I learned that both the FROM address and the TO address is repeated in a hidden element called the "envelope", and then repeated again in the "body". Question Why isn't the envelope data copied into ...

Postfix - sending mail from other domain

I'm a total newbie in postfix, so excuse me if this question looks a little bit silly. My problem actually consists of 2 parts. I have a docker environment for my project, and i need to configure ...

Postfix : Relay Access Denied due to ESMTP

I have setup mailman and postfix, but the mails are not sent to through the mailing list. Postfix rejects it because the recipient domain is not added in postfix_domains. This is my main.cf: ...

Exim refuses to static route

So I run a cpanel server with exim. I want a few of my domains to go through an external smtp service (spam filterer). I have put every possible configuration combination I can think of in the exim ...

smtp relay shows temporary lookup failure

We deploy a new smtp relay server in ubuntu. When send test email from the root the mail flows properly. But when we use it as relay server it shows "temporary lookup failure" Where should we need to ...

How to properly use SMTP authentication?

I have been trying to configure Postfix to use SMTP authentication. When I telnet on port 587, I appear to be authenticating correctly, but the mail fails to reach its destination and instead comes ...

Receiving status notifications in Office365 from HP Color LaserJet 4730mfp

I am looking to configure status notifications from our hp mfp printer to Office 365 using either direct send or smtp relay via our Windows 2008 R2 server. I'm not sure what settings to adjust in ...

Combating a persistent spam list

We use Office 365 as our primary mail provider. We have an internal mail server that we use for relaying things like reports from our SSRS, scan to inbox for old scanners, etc. It is an IIS SMTP on ...

Can I safely remove all mail services from CentOS?

I've inherited 3 legacy shared servers all running CentOS. We no longer offer any email subscriptions from our servers and have migrated everyone to cloud services. These servers host about 60 ...

Incoming e-mails for virtual users on Postfix (+Dovecot)

I have Postfix installed alongside with Dovecot on a Ubuntu 16.04 LTS machine. I tried to send e-mail. Everything was OK in the mail log (/var/log/mail.log) but couldn't figure out where Postfix/...

Using Postgres as an external database for iRedMail

I want to use PostgreSQL with iRedMail as an external database. How to configure iRedMail using the config files to connect with an external Postgres database ?

550 5.7.1 error message followed by an encoded string

We are trying to send simple test emails to a remote server (not under our control) and we get rejected with this message: 550 5.7.1 Message denied by policy. ...

451 too many messages, slow down. Check your SPF record is correct [closed]

i have a dedicated server with 4 domains installed on it . For email service i have an external service (SMTP) because in the past i had not long time to spend on server configuration. Now i wan't ...

Using dedicated IP for mail and website (different from server)

I currently rent a dedicated server with an IP 1.1.1.1 and I've added a domain with IP 1.1.1.2 with DNS records (domain.com/mail.domain.com), MX record, SPF record etc all pointing at 1.1.1.2 The ...

Gather multiple SMTP server with multiple domains, proxy?

This is my current configuration: 4 SMTP servers running on Exim4, smtp1.mydomain.com, smtp2.mydomain.com, smtp3.mydomain.com and smtp4.mydomain.com. All these servers are hosting multiple domains. ...

Multiple domains mail header not personalized

I've got a dedicated server (Ubuntu 14.04) with Postfix/Dovecot on IP 1.1.1.1 I'm hosting 4 domains: 2 on IP 1.1.1.1, 1 on IP 1.1.1.2 and 1 on IP 1.1.1.3. Each one of these domains got a DNS record (...

IIS 6.0 UTF8 support for local email robért@domain.com

IIS 6.0 UTF8 support for local email robért@domain.com 2 hours, 38 minutes ago|LINK Is there anyway for IIS 6.0 to handle the local part of the email with UTF-8 Characters - robért@domain.com I have ...

SMTP, disappearing E-Mail

I have an Ubuntu Linux system which hosts the domain zbmc.eu registered at gandi.net. The zone file there is configured to point at this system and the MX record is set up too:- chris@cheddar$ host ...

Cannot send mail among local machines: No address associated with hostname

I am attempting to send emails between 2 machines with postfix running on both of them. The variables myhostname is properly set to hostname-1 and hostname-2 respectively in /etc/postfix/main.cf: $ ...

How do I start SMTP in SBS 2011? [on hold]

Noob alert! How do I start SMTP in SBS 2011? I say SMTP, that might be wrong. Our server is not responding to requests from the Internet, to deliver email to us. Microsoft Exchange Transport is ...
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Setting up aliases with Postfix and Courier-IMAP

I have set up a Postfix mail server which uses Courier in order to provide an SMTP service. On my server there is a user called joe. I used alias maps to make mail to test@example.com redirect to joe ...

Effects of restrictions in Postfix

My question is similar to this one, but I am running a newer version of Postfix and the answers there didn't really answer my question. I am running a Debian Jessie server with Postfix 2.11. So far ...

Most received mails are marked as spam

I use Google Mail for all my personal mails. I use a custom mail address which is configured to forward all mails to my Google Mail account. When sending mails I use the feature to use another smtp ...

postfix/submission/smtpd[xxxxx]: warning: hostname <**> does not resolve to address <IP>: Name or service not known

I installed iRedMail on VPS (Ubuntu). Fail2Ban bans my home IP address. In /var/log/mail.log I see messages like: postfix/submission/smtpd[32149]: warning: hostname unallocated.sta.lan.ua does not ...

Hotmail DMARC reports show errors in DKIM verification, but not always

I set DKIM, SPF and DMARC on my domain. I placed on the DMARC register I want to receive reports to see if my implementation of rules it's ok or not, to set a strict rule to say if something it's ...

Cannot send email (The revocation function was unable to check revocation)

I want to send an email (SMTP) from a program called EurekaLog but I get this error: The revocation function was unable to check revocation because the revocation server was offline My email is ...

VPS Setup with dovecot and exim with multiple domains email sending issue

I have a VPS with exim and dovecot with multiple domains. Each domain is running a Wordpress site. My main server is running a smarthost relay to another server where port 25 isn't being blocked. ...

Send mail without MTA, GMail, etc

Why doesn't it seem to be possible to send mails from the command line without any kind of SMTP server? All solutions that I found either use sendmail, postfix, etc. (those are SMTP servers as far as ...

Gets “POP before SMTP” still done today? [on hold]

I thought POP before SMTP is dead since smtp-auth is wide spread. Am I wrong? Is "POP before SMTP" done by well-known providers?

Postfix External SMTP Authentication - Wrong login user?

I am trying leverage Postfix as an SMTP relayer on a Raspberry Pi to allow other systems on my network to email outbound system messages. It appears there are two problems, (1) it's not authenticating ...

“Fetching” SMTP connections

I'm struggling to word this question so please bear with this preamble. We use a product called Serv-U from Solarwinds as an sFTP server as it has a gateway feature I find really handy. The server ...

why can the Sender field not be easily configured?

To clarify this and this explanation for Sender:: In brief, From: in the message indicates the mailbox of whoever wrote the message, Sender: indicates the entity which sent a message on behalf ...

exim4 - unable to send / receive email (open relay?)

I believe my server SMTP has been compromised and i am not really sure what/how to go about it. My log files are full of lines such as : 2017-01-28 12:54:29 1cWVWv-0007kW-AW == wcandace48@yahoo....

New smtp 500 or 550 rejection when sending/receiving email when some host based email ISPs. I use Exchange 2010 hosted in house

I have an in house Exchange server edition 2010 which has worked fine for 6 years. Very recently I have started to have problems sending mail to and receiving email from some email accounts which are ...

Postfix fails to send requeued (back to the active queue) deferred emails

So, I've been digging into the pits of Postfix lately in order to administrate my mail server. For various reasons, some of which I haven't yet explained, I ended up with lots of deferred emails, and ...

Configuring SMTP mail relay for multiple sites on same server

We are using Mailgun to send outgoing mail from our web server. This web server hosts 2 sites, website-a.com and website-b.com We needed to add both of these domains to mailgun (on their GUI), and in ...

What settings are needed for Zurmo CRM to work on 1and1 hosts

Zurmo CRM a free open source CRM system supports (as of Jan 2017) only SMTP outgoing mail. on YOUR_CRM_DOMAIN/app/index.php/emailMessages/default/configurationEditOutbound I set the following ...

To-Recipient Required in Email?

I would like to know if a "To"-Recipient is required in an e-mail per definition or if all recipients could be Bcc or Cc. RFC5322 states The only required header fields are the origination date ...

Postfix Connection refused (port 25)

I'm trying to send email through a Postfix server. From the command line, if I enter: echo "This is the body of the email" | mail -s "subject line" me@example.com` Then the error I see in log/mail....

exchange server 2010 smtp basic authentication

I have 2 servers. Server 1 is a linux webhosting server. We receive e-mail on that server. Server 2 is Windows where Exchange Server 2010 is running at. We have a service which runs on the background ...
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