Newest smtp Questions

Q&A for system and network administrators

354 End data with <CR><LF>.<CR><LF>, mail not sent

I know, there is already an answer to this smtp-status, but sorry: i don't get it. A Customer of mine sends a big amount of mails and some can't be send cause of: This is the mail system at host ...

Why does nmap scan of same target smtp server show port 25 missing

I am configuring a new server, on a new network and struggling to get outbound SMTP to work to known mail servers. If I do an nmap scan from my existing server - port 25 shows up, but from my new ...

SMTP connect() failed when request comes from browser

I have a PHP script which send email using PHPMailer library. When I run the script in the SSH using PHP command, it sends email perfectly. But when the request for the same script is coming from a ...

I have to input HELO/EHLO commands twice before it registers on receiving server while testing SMTP

We have an Exchange Server (2010) on site that sends our mail to the world using MX(DNS) records. When I look at the queue, several domains have 421 4.4.2 Connection dropped due to ConnectionReset. I'...

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 ...

Is there any way to relay e-mail without authenticating?

Deployed simple Postfix setup. Currently using Google's SMTP server as smarthost: relayhost = [smtp.gmail.com]:587 smtp_sasl_auth_enable=yes smtp_sasl_security_options=noanonymous smtp_use_tls=yes ...

How can I modify the 221 Statuscode-Message in Postfix?

As stated in the title i would like to modify the 221 (QUIT SMTP) Statuscode Message from my Postfix MTA. I've recently seen a good example when i tested Mailgun.org at checktls.com saying: 221 See ...

newly installed postfix client cannot relay to Windows SMTP relay

We had a working Sendmail configuration on our client with this set: DSsmtp.rww-onatfs.be And mail relayed as expected. I installed postfix and removed sendmail. In the main.cf I added: relayhost ...

AUTH NTLM Authentication Format

I am a student worker in Enterprise Systems at the university I attend. We are in the process of converting to a new version of Exchange. We are attempting to use telnet to track messages in our test ...

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 (...

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 ...

Make Postfix require SASL authentication for mail-from mydestination

In Postfix, I need SASL authentication to be required for all MAIL-FROM the local domain (domains in the "mydestination" parameter). From following online documentation including other discussions ...

Thunderbird can send emails over own mailserver, K-9 not

I switched to K-9 and APG recently to send and recieve emails and be able to en- and decrypt emails on the go. I've setup my own email server quite a while ago and everything works fine in Thunderbird,...

Why does my server hostname appear in SMTP email headers sent from another domain?

I have seen some similar questions here however i am still to find a proper fix to this issue. The issues are as follow: I am trying to send emails from this email@domain2.com email address I ...

SMTP load balancing with remote host's IP passed through to SMTP servers?

I'm attempting to build a load-balanced SMTP cluster. The mail servers already exist and run Exim 4. Initially, I looked at using Nginx to do the load-balancing, however on the test system all the ...

Primary Smtp Address valid format for New-Mailbox cmdlet

I am writing simple application that utilizes the New-Mailbox cmdlet. One of parameters that is set is PrimarySmtpAddress. Provided Smtp address must be valid, otherwise the call will fail. I was ...

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....

SMTP doesnt allow me to login (dovecot postfix SSL)

So i followed an tutorial to setup a mailserver but sadly SMTP doesnt seem to work. It also doesn't show any errors in /var/log/mail.log or /var/log/dovecot.log. Seems like im the only one that has ...

How do I configure an exim4 server to have different retry times for any local domain

My server handles a number of local domains, which (for reasons of compatibility with legacy software) are stored in a mysql database. Messages are delivered via an external "pipe" driver into ...

“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 ...

Route inncomming SMTP mail on windows 2012 server

I have two SMTP domains (subdomain1.mydomain.com, subdomain2.mydomain.com) these two have a MX record pointing to smtp.mydomain.com I have installed Microsoft SMTP server on the server at smtp....

Determine SMTP server technology

I know how to determine who provides the SMTP servers for a domain name (DNS MX RR, DNS PTR RR, etc) but is there a way to determine what the SMTP servers are for a domain name (Microsoft Exchange ...

How to enable TLS for SMTP in II6 on Windows Server 2012 R2

I correctly bought a SSL certificate for my domain www.omniservice2.it from Aruba Business on my server with Windows Server 2012 R2. I correctly installed the certificate in IIS 8 on every site and ...

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 ...

mail header “from” domain is automatically replaced by server's domain, why?

The mail header "from" domain of any mail sent to our company's server is replaced by server's domain. For example: example@gmail.com send an email to our server(company.com). We see the sender of ...

Exchange 2013 Banner

We have an exchange 2013 server that is failing a reverse SMTP Banner Check: 220 [Internal IP] ESMTP Smtpd; I have gone into our exchange receive connector for the internet, "Default frontend ...

Relay All mails of a domain with a SMTP server and store it

A customer have a domain on google apps and he wants to archive all the mail that come to the MTA server. I think that I can add a SMTP server to receive the email which would send all the emails to ...

What are our possibilities when we have dynamic IP and want a mail server behind it?

We have a connection with dynamic IP address. We have an SMTP server behind that. Q: What are the solutions to make it work in real life? The problem is the IP could change, how to put a domain ...

Why are SMTP queue lifetimes days instead of an hour or two? [duplicate]

First, I found Outbound mail queue lifetime standard and read http://tools.ietf.org/html/rfc5321#section-4.5.4 I'm having a hard time understanding why we should queue messages for so long. Doesn't ...

Configure PostFix to Send to Certain Domains First?

I'm currently setting up a large array of cloud servers for my bulk emailing solution using PostFix. Main questions is, am I able to configure PostFix to queue all the emails but only send to the ...

Cisco router outgoing traffic

We have 4 WAN Connections connected to a TP-LINK TL-R480T+ TP-LINK connects to the Cisco Router: ASA5510 The problem is all printers are set up for SCAN2EMAIL feature which they need to use SMTP ...

Is it technically possible to both store and reject an email?

When rejecting emails that are classified as spam by whatever means, there's always the chance of false positives. On the other hand, when accepting emails that may be spam and dumping them into a ...

Different SMTP port for sending and receiving emails (serverside)

My current smtp server setup is like this: Inbound emails: Internet -> server1:25 (haraka1 smtp server) -> server1:2525 (haraka2 smtp server) -> server2:25 (Microsoft Exchange) Outgoing ...

Postfix routes mail it could not deliver to the relayhost

When a message can't be delivered locally for some reason, Postfix uses the relayhost to send the message there, which is IMO pretty pointless. How can I prevent that and either generate an error mail ...

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 ...

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 the next: postfix/submission/smtpd[32149]: warning: hostname unallocated.sta.lan.ua does not ...

Setting up Dovecot to work with a send-only Postfix server

I have setup a send-only Postfix installation which seems to work correctly. The reason, I use this is so that a php application can send an e-mail blast. I would like to use Dovecot as an IMAP ...

Reverse DNS defined, but still not found by a server

I defined a reverse DNS for the public IP of our SMTP http://mxtoolbox.com/SuperTool.aspx?action=ptr%3a95.131.137.225&run=toolpage But still, the mail server of one of our customer answer ...

Digitalocean, Wordpress and Zoho SMTP

I have set up droplet on Digital Ocean (Ubuntu, nginx, php 5.6 and mysql) and I plan on running a Wordpress site. The site has a register/login/notification feature that will require sending out ...

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 ...

Exim and PHPMailer: can't accept authentication when host is localhost

My issue: Using PHPMailer I can't send authenticated SMTP emails when using the localhost Host. I can't see why this is so. I realise the core root of the problem here is almost certainly a setting ...

Configure SMTP in Windows Server 2012 to send emails using another SMTP configured Windows server(Locally connected)

I have already configured an smtp in windows server 2012(call it as X) and can send emails using my web application successfully. But I have an other windows server2012(call it as Y) there I am trying ...

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/...

Postfix immediately closing connection for one client

I have a problem with one client on my mail server (Postfix, Dovecot, Spamassassin, Postgrey). They can log in to pick IMAP e-mail up, but they can't send through the outgoing SMTP server. The imap-...

Setting up postfix as relay but also as smtp

I've set up a postfix server that relays email to another server, this is working fine. I managed this using the relayhost variable. example: relayhost = 192.2.123.25 This means all incoming emails ...

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 ...

Multiple accounts per domain in Google Apps / G Suite

I'm looking for a solution to handle multiple email accounts from multiple domains on Google Apps. I need to be able to send/receive from a single email address from each domain to reach a single ...

PostFix 451 4.3.5 Recipient address rejected: Server configuration

Currently setting up a VPS with DigitalOcean and I've resolved my open relay issue with the following -smtpd_helo_restrictions         =    ...

How to stop mail sent from server from being marked as spam? [duplicate]

I've followed this guide and the 2 other guides linked at the end of the article to stop emails being marked as spam. Many times I don't receive the email, or it arrives extremely late. Postfix ...

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: $ ...
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