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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2
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2answers
166 views

vps: smtp working on server client (roundcube) but cannot be configured on desktop client

I've bought a VPS and installed Ubuntu 12.04 on it. I'm using Zpanel for my Control panel and everything seems to be configured well. I can even send and receive mails on my server itself, via the ...
1
vote
1answer
196 views

Exchange 2010 - Unauthenticated users can send/relay local mail via telnet. How to stop this?

I'm completely new to Exchange administration. I have Exchange 2010 installed and working for the most part. The domain in question is mydomain.com. I have checked to make sure the server is not an ...
0
votes
1answer
192 views

Capture virtual vagrant server smtp on my actual computer

I'm running a number of virtual servers using vagrant on my computer. This is working well. I have installed Postfix to send SMTP inside these virtual servers. But what I want to do is have Postfix ...
0
votes
1answer
126 views

Postfix: can't send mail from remote client

I'm having issues sending mail from postfix. I believe my conf. is very standard, at the end it was put together from various guides. I'm trying to send mail from remote client (iOS Mail, and Mac OS X ...
0
votes
1answer
48 views

Exchange 2010 550 5.1.1 Recipient Rejected Error

About 3 weeks ago, we migrated our email solution from one hosted Exchange 2003 environment to another hosted Exchange 2010 environment. I currently have an outside user unable to send emails to our ...
1
vote
1answer
38 views

Exchange 2007 send as different user by default

Allow me to explain in detail. I have a client who runs 3 companies under the same roof. Each user has 3 exchange mailbox accounts (for each company domain) which they load under either Outlook 2007 ...
3
votes
2answers
84 views

SMTP: Which IP should I monitor?

I use a relay server to deliver external mails. I use relay server's IP in SPF record. But I'm not sure about blacklist monitoring/checking. Should I check main server's IP or relay's IP?
0
votes
1answer
176 views

Postfix relay mails from a single domain and IP

we have an Mdaemon server which redirects outbound mails to an external basic Postfix relayer. We have configured firewall rules (in front of postfix server) to accept smtp requests only from the ...
3
votes
1answer
518 views

Postfix client host rejected

I set up Postfix+Courier+Roundcube on Ubuntu 12.04, but when I try to send an email with Roundcube, I receive the following error: /var/log/mail.log : Dec 30 20:54:35 server postfix/smtpd[31465]: ...
0
votes
2answers
1k views

SMTP -> ERROR: RCPT not accepted from server: 554 5.7.1 : Client host rejected: Access denied

I am trying to send mail through phpmailer with smtp.i am using the host which i am using on my outlook with same username and password.I am getting an error .can anyone help me how to fix this. My ...
0
votes
1answer
66 views

Outgoing SMTP Blocked

I have an Exchange 2013 Server. My ISP blocks port 25 and it doesn't seem to be working on any other port either. I am currently using DynDNS' hosted SMTP service - but it only lets me send a few ...
0
votes
1answer
1k views

Postfix (delivery temporarily suspended: conversation with mydomain.net [private/lmtp] timed out while receiving the initial server greeting)

I'm running Debian 7.1, Postfix version 2.9.6, Dovecot Version 2.1.7 To set it up I followed mostly this (without the spamass-clamav-greylist bit) I have also got setup smart host relaying via gmail ...
0
votes
1answer
198 views

Mails sent from Roundcube on xampp not visible in Gmail,Yahoo or Hotmail Inboxes [closed]

I have downloaded and installed Roundcube 0.9.5 on my xampp server on Windows 8.It works well when receiving mails as the mails show up in inbox normally. But when i send a mail from the logged in ...
0
votes
2answers
111 views

Exim internal sending incorrect authentication

I have a problem with sending authenticated e-mails via SMTP on my hosting with CPanel using Exim. The problem occurs only when the script send (connection) is performed internally on the server. ...
0
votes
2answers
231 views

Exchange 2010 - External emails not being sent, probably an SMTP/DNS issue but need advice

I've installed and configured Exchange 2010 on Server 2012 functionally enough that I can send email between boxes on the local server. For what it's worth, I'm doing this as a test-run in a virtual ...
2
votes
3answers
72 views

In a linux-based email server, how can one prohibit SMTP/IMAP/POP connections from clients while still using Webmail (Roundcube)?

With a fully functioning linux-based email server (running postfix/Dovecot) how can one disable the ability to connect to SMTP/POP3/IMAP with external mail clients (or telnet, etc) while still (and ...
0
votes
0answers
189 views

Email server fails to authenticate my client, returns “use web to login”

I'm trying to send a mail message using System.Net.Mail.SmtpClient via Yandex Mail and have the following transcript: S: 220 smtp17.mail.yandex.net ESMTP (Want to use Yandex.Mail for your domain? ...
1
vote
2answers
109 views

Postfix smtp for sending only

The web hosting provider of my company have a mail server with a sending limit of 300 mails a month so the idea is keep using the hosting mail for the mail spool but set up a local Debian server with ...
0
votes
1answer
65 views

How to override an MX value for a particular domain using a transport_maps but have some form of redundancy

I have a postfix mail server and I want to override an MX value for a particular domain. From my understanding this is can be done by the use of transport_maps ...
2
votes
2answers
75 views

Postfix doesn't require authentication for local emails?

I've got a Postfix/Courier mail server (Authenticated with SASL/MySQL) all according to this tutorial. I'm currently running my server on Debian 6, it is a VPS. It works well as far as I can see but I ...
1
vote
2answers
250 views

HAproxy for postfix

I want to setup HA postfix mail servers with 2 postfix instances. I have two postfix servers and I configured two postfix instances on these servers. Now I want to know how to configure HAproxy ...
0
votes
1answer
51 views

If one SMTP Server is down, routing all requests to another, how to achieve?

I have an application which uses e-mail notifications at many levels, so if an SMTP Server is down, I get in trouble. I can't switch the SMTP adress in all my configs fast, or lets say even don't want ...
4
votes
2answers
348 views

How to remove the SMTP address for a secondary domain from all Exchange mailboxes?

I have an Exchange server which used to manage multiple SMTP domains; now it only has to manage one. I have already removed the secondary domain from all address policies; I need to remove all SMTP ...
0
votes
0answers
358 views

SMTP issue causing mail to not be forwarded?

When I send an email to something@mydomain.com, expecting it to be forwarded to myemail@gmail.com via the default address set up in cPanel, it just never arrives.. If I set up an email account in ...
-3
votes
1answer
134 views

How to configure sendmail to use different SMTP relay servers [closed]

How to configure sendmail to use different SMTP relay servers. For example: For all gmail.com recipients sendmail should use gmail SMTP server obviously with Gmail smtp auth. For all yahoo.com ...
0
votes
1answer
306 views

TLS connect failed: error:140943FC:SSL routines:SSL3_READ_BYTES:sslv3 alert bad record mac while sending mail via Qmail

I'm trying to send e-mail to one of the biggest polish hosting companies and their servers are refusing to receive it with message: TLS connect failed: error:140943FC:SSL ...
0
votes
1answer
47 views

amazon ec2 smtp ipv6

I have an Amazon EC2 instance. My postfix server sometimes tries to send outbound emails (web form etc) to ipv6 addresses. It fails and the emails go into the queue. Is there a way to prevent ...
0
votes
0answers
70 views

Postfix forward unknown email address to another server

I have a postfix setup with multiple domains, which is managing mailing lists for several domains. Previously, all of these domains actual email addresses have just been aliases to other email ...
2
votes
2answers
51 views

Move Maildir safely on running server

I want to move some Mailbox directories to a new disk while postfix and courier imap daemons are still running. The question is ¿what happens if a new mail is recieved into the Mailbox while moving ...
5
votes
1answer
265 views

saslauthd multi instance for postfix smtp authentication

I have mail server Postfix+Saslauth. I configure multiple instance for Postfix: postfix postfix-out and two instances for saslauth: saslauthd saslauthd-out Setting saslauthd is ...
1
vote
2answers
231 views

Iptables blocking smtp

Iptables is blocking outgoing and incomming smtp on my server, although I specified it not to. My policies are DROP everything except what's specified. Changing policies to ACCEPT everything "solves" ...
0
votes
3answers
108 views

SMTP sent E-mail not copied to Sent Folder [closed]

I discovered that some (few) providers don't copy into the Sent folder those E-mails which are sent from mail clients through SMTP. They only copy them to the sent folder if you send them from their ...
0
votes
1answer
143 views

SMTP routing with EDGE servers for Exchange 2010

I am trying to set up some EDGE servers for Exchange 2010 (SP3 UR2) but they are being a real pain. I have the following servers in my environment: CASHT1 – CAS array member – FQDN is ...
1
vote
0answers
19 views

Is it possible to prevent emails being sent from an address absent from the AD user's account?

I'm using Exchange Server 2003 on a Windows Server 2003 which is also a domain controller. If a client connects through SMTP using his AD username and password, he can send email from any email ...
0
votes
2answers
151 views

Why don’t SMTP servers just require all senders to be authenticated before accepting mail? [closed]

Why don’t SMTP servers just require all senders to be authenticated before accepting mail?
0
votes
1answer
225 views

Postfix and saslauthd on Debian Wheezy not working after upgrade

Since upgrading to Wheezy I've been unable to send emails via my own mail server which used to have a functioning combination of Dovecot, saslauthd and postfix using pam. Now, running testsaslauthd ...
0
votes
1answer
917 views

Bounce message from gsmtp - weird message path

please consider the following email headers from a message that was returned to the original sender. The multipart bounce message also contains the transcript (clear text + HTML) of the correspondence ...
0
votes
0answers
26 views

How to configure SMTP to recognize a group

I'm using a windows server. I installed IIS SMPT server and using it. I have no problem when I send a mail to individual id. But I get an error when trying to send to a group. InternetAddress ...
0
votes
2answers
125 views

Issues using Amazon SES as relay with sendmail [530 Must issue a STARTTLS command first]

I'm trying to get our old rhel3 servers relaying out with sendmail 8.13.1 I have followed amazon's guide here: http://docs.aws.amazon.com/ses/latest/DeveloperGuide/sendmail.html But it seems the ...
6
votes
2answers
379 views

Display a TLS icon for messages that are TLS secured (Outlook)

One of my colleagues at a large financial institution has customised Lotus Notes to show a TLS icon for messages that are TLS secured. I'm interested in imitating this feature in Outlook, and believe ...
0
votes
0answers
20 views

centos rely access denied postfix send mail [duplicate]

I am trying to send mail from my centos using postfix configuration but getting error as 554 5.7.1 <dummy@gmail.com>: Relay access denied my postconf -n shows belog information ...
0
votes
1answer
84 views

Postfix: Possible to overwrite Return-Path via SMTP

I tried sending mails via SMTP and provied a Return-Path. Postfix seems to override my values with the "From"-Header. When im sending Mails via PHP, I am able to set the Return-Path Header with the ...
0
votes
0answers
29 views

Mail server in the middle responsible for translating from one domain to another

The title is a little confusing. We have an internal mail server that can be used to send mail. This internal mail server is only accessible from within our firewall unless we use the mail server's ...
0
votes
1answer
1k views

554 5.7.1 <mail_addr>: Relay access denied centos postfix

I have problem in send mail from postfix in centos I have following setup mail server postfix for sending mail but I am getting error. As in the link I tried following commands telnet localhost ...
1
vote
0answers
66 views

Custom Transport Agent: How do I collect NDRs and all other undeliverables in Exchange 2010 from the Postmaster?

I'm trying to collect all NDRs in a single mailbox for all invalid recipients, and anything that fails for any reason. I have a custom transport agent, that I've written myself that appears here: ...
0
votes
1answer
189 views

Cannot connect to remote port 465

I (actually, not me, rather a friend of mine) have a very strange issue. There's a VPS with CentOS, probably version 5: Linux [hostname] 2.6.18-274.7.1.el5xen #1 SMP Thu Oct 20 17:43:28 EDT 2011 i686 ...
2
votes
1answer
788 views

Cannot send email from EC2 instance on port 587

I have written a mail service for our flask application that uses Celery and RabbitMQ to send emails (using gmail). I have got the celery consumer and producer communicating okay but I cannot get to ...
4
votes
2answers
131 views

SMTP allows for multiple FROM addresses in the RFC. Was this ever useful, why does this exist?

SMTP allows for multiple FROM addresses on the body (not the envelope) according to the RFCs. Has this feature ever been used for a legitimate purpose? Is it safe to discard messages that have ...
0
votes
2answers
623 views

Postfix not sending/allowing receiving of messages after server (hardware) changed

We had na old notebook runing Ubuntu 12.04 working as a web/ftp/mail server and it worked but since the notebook was a notebook and pretty old and unreliable, a desktop was bought to replace it before ...
0
votes
1answer
77 views

IIS SMTP Server as MTA

I have domain xyz.com. I'm sending mail using MTA. through Symantec Cloud. My setup is as follows. [Symantec Cloud]<->[MTA]<->[Local Mail domain] all the mail out side the domain(xyz.com) goes ...