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.

learn more… | top users | synonyms

3
votes
0answers
23 views

How can I explicitly disable TLS when sending to one specific recipient?

I have a SendMail 8.14 server deployed in the middle of an SMTP workflow (Outbound mail looks like Exchange -> SendMail -> Appliance -> Internet) I have TLS configured for the first three hosts. ...
2
votes
0answers
35 views

Getting “5.7.1 Unable to Relay” intermittently on mails sent to Exchange 2013

I have a helpdesk system that sends mails through the local exchange server. Until a few days ago, I never had issues with it. For the last week we have started getting complaints about missing ...
2
votes
0answers
235 views

Forcing IIS virtual smtp server to verify outgoing TLS certificate

I am in a situation where a web application is using the IIS virtual SMTP server to send out email. The IIS virtual SMTP server is then configured to send all mail out through a smarthost, over TLS ...
2
votes
0answers
191 views

How can I change the default email address format type for replies on blackberry?

Exchange 2007 BES 5.0.x Hello all, I'm trying to help a colleague with a technical issue. I apologize in advance for not having all of the information. I'm looking for some advice on where to ...
1
vote
0answers
130 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
vote
0answers
98 views

Exchange 2010 – Multiple Smart Hosts

A client has Exchange 2010 which, up to now, had a single internet connection. They were sending email via a smart host run by their ISP. It was working OK. We have put in a second internet ...
1
vote
0answers
361 views

How Do I Configure Nginx To Communicate with SMTP Server?

I'm an application developer and have little knowledge on sysadmin / server configuration tasks. I have an nginx server communicating to a Flask web application through uWSGI on a VPS. I'm trying to ...
1
vote
0answers
1k views

Office 365: 'client smtp submission' suddenly starts failing. How to diagnose client auth error?

Since a few days, my application fails sending SMTP email. The app is in fact a scheduled task (which is running on my local machine, written in C#, using SmtpClient) and occasionally needs to send ...
1
vote
0answers
298 views

Configuring Monit to Send Mail through Office365

I'm trying to configure monit to send emails through Office365. Here's the relevant configuration: set mailserver smtp.office365.com port 587 username "username" password "password" using ...
1
vote
0answers
4k views

550 5.7.1 Message Rejected due to content restrictions

I have a server that for some reason, out of the blue is now having a huge amount of its email being rejected, coming back with 550 5.7.1 NDR's or various derivatives thereof. This just started ...
1
vote
0answers
72 views

Using mime_header_checks to ACCEPT instead of REJECT?

I'm pretty well versed in using header_checks/mime_header_checks to refuse smtp mail in Postfix, but now I think I've gone off the path of righteousness; I'm trying to suss out a way that I can refuse ...
1
vote
0answers
121 views

Outlook on Exchange: Why does it mangle return address for some email?

We have seen this too much in multiple Exchange environments, and need some guidance. When we email (using simple mail client app) to certain Exchange/Outlook sites, when those sites hit Reply, our ...
1
vote
0answers
20 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 ...
1
vote
0answers
89 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: ...
1
vote
0answers
225 views

Exim SMTP Smarthost Setup

I used these settings to set up exim to use gmail as a smarthost, which worked. However, I don't seem to be able to use these settings against other smtp servers, such as Yahoo or Fastmail (both with ...
1
vote
0answers
75 views

Can someone explain SMTP Callbacks when BATV is enabled, and when to issue the verification?

This Wikipedia article describes how SMTP verification of the MFROM may have issues if BATV is enabled. Servers that reject all bounce mails (contrary to the RFCs). To work around this problem, ...
1
vote
0answers
167 views

4.4.1 Timeout in 10 minute intervals SMTP on batch email jobs

I am running a job that uses SMTP and it can run in excess of an hour, emailing the entire time. It's not my code but a workflow based app so I just get a form to configure the mail server, subj, msg, ...
1
vote
0answers
195 views

Fetch all Mail from an IMAP server with Postfix to distribute on local IMAP server

The situation: The constellation: We have a managed, dedicated server from a professional provider. We currently have Tobit David.fx server in use within our local network which fetches all E-Mails ...
1
vote
0answers
458 views

What are the values of Exchange's XSHADOW and XQDISCARD commands?

Shadow redundancy is an Exchange-specific feature (beginning with Exchange 2010) that provides a measure of fault tolerance when relaying email messages with SMTP. The sending Exchange server sends ...
1
vote
0answers
53 views

Adding real SSL to SMTP mail

I have a domain that I check my SMTP mail on. For PCI reasons for a different domain on the same server, SSL is forced for mail. Now that the forced SSL is in place, I can no longer check my SMTP mail ...
1
vote
0answers
200 views

Postfix: Modify sender address based on recipient

We have a Postfix server that receives mail from our application servers. Senders are in the form user@host.fqdn (where host.fqdn can vary, depending on source server) and recipients can be internal ...
1
vote
0answers
855 views

530 5.7.1 Client was not authenticated Exchange 2010 for some computers within mask

We have a classic problem with Client not Authenticated but with a specific twist: We have an Exchange 2010 cluster, let's say EX01 and EX02, the connection is always to smtp.acme.com, then it is ...
1
vote
0answers
304 views

IIS 6 Smart Host Outbound Security

I'm using the IIS 6 smart host setting to forward all email sent through IIS to SendGrid. It works fine if I set the Outbound Security and smart host settings at the top level of the Default SMTP ...
1
vote
0answers
158 views

Disable local delivery ONLY for authenticated users in Qmail

We are moving some mailboxes and servers. I'm looking for a way to use remote delivery (with normal MX lookup) instead of local delivery ONLY for authenticated users, in Qmail. connection to port 25 ...
1
vote
0answers
304 views

Stop IIS SMTP Server from sending “Delivery Status Notification (Failure)”

I have set the BadMail directory and the 'Send copy of Non-Delivery Report to' fiels is empty but, somehow I am still receiving the failure messages. Is the a way to stop the failure messages?. I am ...
1
vote
0answers
171 views

Mail smtp server configuration for PHP and RHEL

I'm running WordPress on an intranet VM and I need all outgoing messages to reach a remote smtp server. In php.ini there is this specification: [mail function] ; For Win32 only. SMTP = localhost ...
1
vote
0answers
469 views

Exchange 2007 and 2010 Journal Messages Stuck In Queue

I have a simple setup of 2 e-mail servers. My Exchange 2010 server, MS2010, is setup to forward all e-mails that it receives to the journaling mailbox. The journal mailbox is located on my Exchange ...
1
vote
0answers
318 views

How to define mail from and host settings in Websphere 6.1 for Java application

Working with some older WAS 6.1 hosts (fix pack 25), and have a java app that sends mail from one host with a mail from field: nobody@nosuchhost.nosuchdomain.com ...
1
vote
0answers
66 views

Ariel will not send through our SMTP server

I'm currently working at a university that uses Ariel software to send ILL documents to teachers at other universities. They do this by e-mail the documents to the users. We recently switched from ...
1
vote
0answers
167 views

Forwarding emails from a domain

I generally use Google Apps to handle email domains. I'm unfortunately stuck in an infinite loop with Google [1] for one the domains I recently picked up. Right now I use Zerigo's awesome DNS ...
1
vote
0answers
553 views

Problems when using IIS SMTP Pickup Service

In my website, I send emails from my website to IIS SMTP Server (using the pickup drlivery method). IIS SMTP server is set up to forward the emails to a local mail server, XMail Server, running on the ...
0
votes
0answers
7 views

Dovcot SMTP “435 Unable to authenticate at present”, But Courier Mailserver Works Fine

I'm having somewhat of a weird issue on my server: My SMTP service stopped working, along with my RoundCube/Webmail services (But I believe this is a separate database issue) When I try to send mail ...
0
votes
0answers
14 views

cPanel/EXIM re-routing mails through Mandrill to circumvent Gmail rate-limit

I have two cPanel domain (lets assume abc.com and xyz.com) where we have 300+ mailboxes. Users email themselves and outside the company. Most of the emails sent outside the company are to GMAIL. ...
0
votes
0answers
30 views

How to connect ubuntu to external smtp on port 587?

I have a fresh ubuntu server installation with no firewall and want to setup ssmtp to an external smtp server (e.g. smtp.mandrillapp.com:587), however, I couldn't get my server to connect to any ...
0
votes
0answers
25 views

Dovecot Relay Access Denied; The SMTP server does not recognize any of the authentication methods supported by Entourage

I have a Dovecot/Postfix installation running, and have set up some email accounts using Vimbadmin. I have successfully set up several clients successfully using SSL to both send and recieve. ...
0
votes
0answers
14 views

AmazonSES + DKIM + Hotmail = temperror

Although SPF is passing, I'm getting a dkim=temperror on hotmail only (it's working on Yahoo and Gmail). I'm using AmazonSES, and already have the proper CNAMES for DKIM signing on my domain at ...
0
votes
0answers
66 views

GitLab can not send email correctly through public SMTP server

I installed gitlab on ubuntu 14.04 server following official instruction. I want to send email to new users using public mail server, like gmail, 163, qq. However gitlab can't send email successfully ...
0
votes
0answers
17 views

Exchange 2013 Outlook “Send to cache”

Having some trouble with users changing AD accounts but their primary SMTP address is moved to the new account. Let me explain: User Andersson1 gets a new AD accout because he changes department and ...
0
votes
0answers
17 views

IronPort, DLP and SMTP integration

We have configured IronPort, DLP and SMTP in my organization. Now I am getting an error message: statin - : TLS handshake could not be completed". Questions: Can anyone please tell me whether ...
0
votes
0answers
132 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 ...
0
votes
0answers
16 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?
0
votes
0answers
105 views

Server sometimes doesn't receives e-mail, with error 451

One of my customers tried to send me an e-mail with his e-mail address that I didn't received. He received a Delivery Status Notification (Delay). I only received the message 2 days later In the ...
0
votes
0answers
60 views

hotmail isn't receiving mail from my server

Hotmail is block all mails (not send to Junk, it really block!) send from my VPS server (even if I send directly from roundcube, for instance). I checked all configs and seems that all is ok. Works to ...
0
votes
0answers
208 views

Exim/Cpanel Email Headers

We have been trying to figure this out for a few days now and have been all over this board as well as a few others, and this refers to Received From and X-AntiAbuse: Primary Hostname headers. We are ...
0
votes
0answers
139 views

Collectd notify_email Plugin Not Working On Ubuntu 14.04

I'm attempting to set up e-mail notifications using collectd and the threshold / notify_email plugins. I'm running Ubuntu 14.04 LTS, attempting to relay e-mails through Amazon SES. Relevant package ...
0
votes
0answers
153 views

hMail server - sending copy of an e-mail changing the sender

Dear All please help me with following request. I am using hMail server in a company(test.com) and have several hundred of guest e-mail accounts (guestxxxx@test.com). I need to accomplish this: ...
0
votes
0answers
122 views

sSMTP Configuration issue for Zoho mail

I was using following configuration to send from Gmail from sSMTP from Ubuntu using PHP # # Config file for sSMTP sendmail # # The person who gets all mail for userids < 1000 # Make this empty to ...
0
votes
0answers
37 views

How to find the smtp connection of an organisational mail?

I am using alfresco 4.2e which uses smtp configuration to send mail. Here is my required configuration mail.host=smtp.gmail.com mail.port=465 mail.protocol=smtps mail.username=abc@gmail.com ...
0
votes
0answers
52 views

How can I limit the amount of messages SendMail will recieve in a single incoming connection?

Is there a way to limit how many messages can be received by SendMail in a given SMTP session? I have a SendMail server and an upstream application server is trying to send dozens (potentially ...
0
votes
0answers
227 views

Posftfix - MTA during fwd-connect Negative greeting

I have problem with postfix on Debian Squeezy (Yes. Squeezy). I can't send email, idk why. My postqueue: root@mx-2:~# postqueue -p -Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient------- ...