SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.

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9 views

Zimbra doesn't send mail via smtp relay anmore

our Zimbra-Server isn't working for outgoing external mail since yesterday. Friday I installed some updates (for shell shock and Kernel updates), restarted and it worked fine. But since yesterday ...
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0answers
18 views

Exchange 2013 (CU6): Can't find named Receive Connector referenced in Event ID 1018

I'm receiving the current Event ID's 1018 on an Exchange Server 2013 (CU6) CAS/Mailbox server causing all received/incoming mail, for all users to be stuck in the mail queue (mail is received from an ...
-3
votes
0answers
22 views

check maximum number of virtual mailboxes on mail server [on hold]

what's the maximum number of virtual mailboxes i can create in Linux mailserver ( Postfix/Dovecot ) ? is there a configuration parameter for this ?
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0answers
6 views

Monitor outbound SMTP Xen node

Using Xen-PV on one of our nodes, looking for some suggestions on how I can monitor anyone sending mass outbound emails. May be using Tcpdump?
1
vote
1answer
29 views

Postfix SMTP authentication

I used this guide to create a mailserver for a small business: https://workaround.org/ispmail/wheezy. IMAP is working perfectly but i ran into an issue with SMTP and Authenticated SMTP. When i use an ...
0
votes
0answers
11 views

Postfix+dovecot+pgsql: Relay access denied [duplicate]

I just set up my first mail server and have one problem with sending email through it. I created an account in thunderbird and I'm able to receive mails sent to my mail-server but I cant send any ...
0
votes
1answer
52 views

Postfix wont send mail to external email addresses listed in virtual_alias_domains

We have our main server at mail.mainserver.com with the catchall address catch@mail.mainserver.com We also have two other domains: domain1.com and domain2.com which are hosted at gmail. Gmail is ...
-1
votes
1answer
37 views

How to setup mail client with external SMTP server? [on hold]

So I am considering using external SMTP services such as SendGrid, Mailjet, Mandrill, etc, to send automated e-mail. Right now, I'm using Outlook.com to send and receive non-automated e-mail for my ...
0
votes
1answer
16 views

Reliably identify sender in Exchange SmtpReceiveAgent

I use Exchange as a simple SMTP server and I want to take specific actions depending on who the sender is. I made a connector which allow basic authentication (auth login) and a SmtpReceicveAgent. I ...
-2
votes
0answers
75 views

Unable to Stop Mail Server Abuse

I have a mail server that has somehow been compromised. Its been well over a week and since then I have changed many settings to no avail. As a first step I saw the mail logs which indicated a high ...
0
votes
1answer
67 views

Postfix SMTP Server fails to send messages to anyone outside the domain

Here is the result of a recent test on my SMTP server, I just want this server to send emails which used to work perfectly upto about a week ago Resolving hostname... Connecting... SMTP -> FROM ...
0
votes
1answer
32 views

Sendmail emails going to spam

I have sendmail installed on CentOS 6 and whenever I try to send an email, it goes to spam on the recipient. (Gmail in this case) OK, so, the domain I was to send mail on behalf of is: scalpello.info ...
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votes
1answer
54 views

Postfix config for backend webservers behind a load balancer

I've two web servers (ws1.example.com, ws2.example.com) with postfix installed locally as a mail rely (using mandrillapp), user access them via www.example.com, which is a load balancer On ws1, the ...
0
votes
1answer
19 views

Sendmail's MTA, MDA and SMTP 550 User Unknown forwarded to postmaster

I have two boxes running sendmail and configured as: MTA accepting connections from the outside world (mta.xyz.com) MDA accepting connections from internal network and storing them in user mailboxes ...
0
votes
1answer
36 views

Postfix: use relayhost only when direct delivery not specified

I read up on using relayhost with Postfix 2.6.6. It's possible to use different relay hosts, with different credentials, for different senders. But how do I use direct delivery with specific senders ...
1
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0answers
43 views

vCenter Server Appliance email's not reaching smtp server

Email's being generated from my test alarms in vCenter are not being forwarded to the proxy / SMTP server configured. I run tail -f on the mail log file when generating a test alarm and I can see the ...
-1
votes
2answers
47 views

“Connection to host lost” on telnet to port 25 [closed]

i installed smtp4dev to test receive mails in my localserver(xampp) for the registration form here: https://github.com/panique/php-login note: localserver is on port: 8080 my php.ini file for SMTP ...
0
votes
1answer
37 views

Client host rejected: cannot find your hostname + SMTP

I have a VPS configured with dovecot. Now for some of the mails that I send are rejected with the following error: Any Clues?
3
votes
1answer
103 views

Port25.com SPF test fails, gmail SPF pass

When testing my SPF record using port25.com's nifty little tool by sending an email to check-auth@verifier.port25.com I get the following FAIL result: ...
1
vote
2answers
127 views

How to redirect smtp port from 25 on one ip to 2525 on another external mail.domain.com? [closed]

How to redirect smtp port from 25 on one ip to port 2525 on another external mail.domain.com? Example: I have ip as xxx.xx.xx.xxx and listening port as 25 for smtp, now I want to forward or redirect ...
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votes
1answer
181 views

Delivery temporarily suspended: Host or domain name not found

I have two independent domain ad.vz and ad2.vz, there is gateway between them. There are 3 postfix servers: mailad.ad.vz - postfix server in first domain mailsh - gateway with postfix and two ...
-1
votes
1answer
50 views

postfix not going to address on same domain with gmail

I am using postfix and gmail small business apps It seems to be working great for sending email to external domains, but does not work when trying to send to email with same domain So for example ...
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votes
1answer
83 views

Emails delivered to Microsoft/Outlook successfully, but do not arrive in inbox/spam folders

Struggling with this for awhile. Have searched everywhere, read every post/thread I can find and have a thread started on Microsoft's "Answers" site, but the replies there are so slow. I am running ...
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votes
3answers
50 views

Dovecot: deliver reply into same folder as replied-to message

UPDATE (2 sept 2014 13:01): Just to clarify, I'm interested in handling an incoming reply from someone else, so coming in via SMTP. If it is a reply to an email that is already in some mail folder, it ...
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votes
1answer
40 views

Automated blacklist checker [closed]

Has anyone used any of these services and if so, is there one you can recommend? Ideal target would be for an MSP so perhaps would like real time alerts if an IP shows up on blacklist for perhaps ...
1
vote
1answer
64 views

Postfix Splitting Domain to Separate Mailstores using LDAP

I'm investigating a new mail setup to replace Exchange in our organization using Cyrus-IMAP, Postfix and Perdition IMAP proxy server. I'm running into issues dealing with sending emails to different ...
11
votes
2answers
305 views

Is it still “wrong” to require STARTTLS on incoming SMTP messages

According to the STARTTLS Spec Section 5: A publicly-referenced SMTP server MUST NOT require use of the STARTTLS extension in order to deliver mail locally. This rule prevents the STARTTLS ...
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votes
2answers
136 views

GMail detecting mail as spam [duplicate]

I've been trying for a long time to get our company's mail server send mail that will get accepted by the GMail spam filter. I have managed making it work for Yahoo Mail and Hotmail, sadly GMail is ...
0
votes
2answers
83 views

Dovecot pop3: Disconnected for inactivity

We've application fetching messages from mailbox inbox. Once, application stoppped fetching, then we'd the following in maillog: Aug 15 11:03:47 server_name postfix/virtual[16743]: 731E258003: ...
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vote
2answers
29 views

Set default gateway based on protocol using pfSense

I have a pfSense configured with two Internet links for broadband load balancing. One of these links block outgoing traffic on 25 port (WAN1). I have a mail server (IP 10.6.9.2) that should use the ...
1
vote
1answer
53 views

Unable to lock error message in SMTP Server

I've the following error message appeared 3 continuous for the same mailbox > (delivery failed to mailbox > /var/spool/postfix/vhosts/<user>/mail/inbox: > > unable to lock for ...
1
vote
1answer
66 views

What happens inbetween SMTP and POP3?

I understand SMTP, and to a lesser degree POP3, but I feel like I'm missing a large chunk inbetween. I see this image on a Microsoft page: and I feel like what I'm missing is the "Internet" part. ...
1
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1answer
224 views

“4.7.0 Timeout waiting for client input” error Exchange 2013

I am having trouble sending mail from several servers with the following error when trying from command line. -> (telnet 25, mail to rcpt to data etc.) 250 2.1.5 Recipient OK data 354 Start mail ...
0
votes
2answers
36 views

Open Postfix or Sendmail to all IP's

Can I configure Postfix or Sendmail to allow all IP's without authentication? I understand that this could lead to all sorts of abuse. We have some monitoring systems that send notifications out via ...
0
votes
2answers
45 views

Which domain should have 'abuse' or 'postmaster' or “fbl” email accounts?

Consider that I am providing SMTP services for several clients and the sender / SMTP domain is mails.mysmtp.com. When client A is using my email infrastructure, he may use from address (from header) ...
0
votes
0answers
99 views

Exchange 2013 Client Frontend connector will not accept TLS

I have a new Exchange 2013 environment running on Windows 2013 R2 with 2x Edge and 4x CAS/Mailbox servers deployed. It is deployed in a resource forest, with proper trust relationships established to ...
0
votes
1answer
146 views

Using SMTP Relay on a Exim Server in VPS for Multiple Domains

I am moving my email behind a dynamic IP, and I will need to SMTP relay outbound email in order to avoid spam lists. My domain is hosted through a BlueHost VPS running EXIM. I am wondering what I ...
0
votes
3answers
73 views

Windows Server SMTP Feature - Installation Ramifications

Background: I am a SQL Server DBA. I have inherited about 50 SQL Servers and need to set up various maintenance plans and alerts. To get the full benefit, I'll also need to configure Database Mail ...
0
votes
1answer
185 views

Setting up ubuntu to send mail from PHPMailer

I have a small server, inside the company where I work, which has an app that needs to send email to notify users for different reasons. I'm using PHPMailer to do this. But as I suspected, I need to ...
-2
votes
1answer
37 views

Limit Emails Per Hour Per IP [closed]

Anyone knows a script or software for CentOS and Windows that can be installed onto dedicated servers with no control panel limiting emails per hour per IP or full block. Thanks in advanced!
0
votes
1answer
53 views

Exim4 require TLS for all hosts but localhost

As my webmailer does not support STARTTLS and I want to enable relaying for everyone at localhost, I would like to have Exim advertise AUTH PLAIN and LOGIN only without TLS if the connection was ...
-1
votes
1answer
85 views

Postfix sends as hostname.domain.com instead of domain.com

I've been trying to set up a debian mail server running postfix, but when I try to send mail via mail example@outlook.com the recipient sees the sender as hostname.domain.com. The hostname it sends ...
-1
votes
1answer
54 views

Postfix cannot send to external domains

I set up my Postfix with a sasl link to a Dovecot user / domain database. Postfix is giving the following error message when trying to send mail to external recipients (internal are fine): Server ...
-5
votes
1answer
139 views

How to setup SMTP server to allow mailing to any recipient? [closed]

I have a windows server, acting as a web server and mail server. For the mailserver I use hmailserver and works fine recieving emails but not so good sending emails because I cannot setup reverse DNS ...
0
votes
1answer
75 views

Is there a way to send email using port 465 only? [closed]

I'm trying to send email via port 465 since my ISP has blocked the port 25. openssl s_client -crlf -connect example.com:465 EHLO example.com AUTH LOGIN sdgfsdgfdgdfg dfgdfgdf mail from: ...
0
votes
1answer
70 views

Postfix virtual mailbox base, uid, gid — good user and group choice?

I often see tutorials for setting up Postfix with the virtual mailbox delivery agent on Linux that instruct to create a new disabled-login user and group to own virtual mailboxes in ...
0
votes
1answer
48 views

Trac notifications (smtp) and Postfix

I've two separate ubuntu 12.04 servers. Runs Trac (homeserver/Dyndns) Runs postfix (VPS/staticIP) I configured trac to use TLS and connect to postfix server. Trac config: admit_domains = ...
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votes
1answer
36 views

At what point should I dedicate a server for SMTP [closed]

I currently have a 2GB RAM windows server 2012 which is has IIS and SMTP installed on there. Now I seen alot of people leave SMTP out on the webserver and buy a server just dedicated to handle the ...
0
votes
1answer
123 views

Postfix still complains that “certificate verification failed” even when “smtp_tls_security_level = fingerprint”

I'm attempting to use Postfix (version 2.6.6 on RHEL6) to connect to and send mail via a mail relay on our internal network. I want to connect with STARTTLS on port 25 (port 465 is not available on ...
1
vote
1answer
39 views

Swiftmail cannot use sendmail/postfix

When I try to run some Kohana swiftmailer I get the following error in maillog: Jul 23 17:18:37 ads postfix/sendmail[5818]: fatal: execv /usr/libexec/postfix/smtpd: Permission denied The output of ...