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Questions tagged [smtp]

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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2answers
256 views

How do I find out if my email server sends out an ip address with my emails? [closed]

I read in a publication that most major email providers include your ip address when sending out emails. The exception being gmail. I'm told this can give you alot of spam. Here at work, we use our ...
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4answers
2k views

Not able to send mail through smtp.gmail.com

I want to send mail through "telnet smtp.gmail.com 25" but an error is prompted when sending a message "530 5.7.0 Must issue a STARTTLS command first". I am working on Ubuntu Linux Server. I ...
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1answer
49 views

Office 365 SMTP encryption

AFAIK Outlook is using POP/IMAP protocol to access mails in Office 365. I occasionally have seen instructions for 3rd product integrations with Office 365 that required configuration of mail routing ...
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1answer
1k views

Will exchange server receive emails with wrong address [closed]

Say if I sent an email to user@theirdomain.com, the exchange server and the user will receive it, but if I sent an email to fakeuser@theirdomain.com using SMTP client, there will be no fakeuser ...
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2answers
315 views

SMTP server on debian 6.0 linux

I have some questions: I am using a SMTP service for sending monthly newsletter for my website (~3000 email addresses). I was thinking: I already own a virtual server configured as a web server and ...
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2answers
1k views

Linux Postfix Setup on a fresh VPS [closed]

I've launched a new VPS with CentOS 5. It's pretty skeletal, nothing setup. I'm trying to configure my mail server to handle my email: contact@domainname.com My DNS settings live on GoDaddy.com. I ...
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1answer
370 views

Server is can't connecting to any smtp port [closed]

On my VPS server I'm trying to smtp but its not connecting root@server1:~# telnet smtp.gmail.com 587 Trying port_number... Trying port_number... Trying ipv4_address... telnet: Unable to connect to ...
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3answers
2k views

change smtp banner on mail enable [closed]

I want to set an SMTP banner for MailEnable. I followed the instructions here and nothing happens. When I telnet to my server on port 25 I am getting the following: 220 MyComputerNameHere Microsoft ...
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votes
1answer
250 views

Setting sendmail to send mail for another server [closed]

I have a server with CentOS+Plesk+Qmail, I want to set it to send mail trough another server (CentOS+Sendmail). What do I need to set at the second server end in order to accept and deliver email for ...
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1answer
3k views

How to turn on SMTP relaying? Getting error: “SMTP Error: The following recipients failed [address]” [closed]

Attempting to configure some software on our server to send email via SMTP. When testing it, get this SMTP Error: SMTP Error: The following recipients failed [address]" Based on my research and a ...
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2answers
613 views

iRedMail: Going to spam when sending from Postfix to Hotmail and Can't use port 465

I installed postfix and dovecot using iRedmail. During the installation, i supplied iRedmail with server.mailtuner.com as the hostname for the SMTP server. But! My Let's Encrypt SSL certificate is ...
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1answer
566 views

SMTP Server with dynamic / Static IP

I have 3 servers and 3 IP's. Server 1 - Static IP - 111.111.111.111 Server 2 - Static IP - 222.222.222.222 Server 3 - Dynamic IP - 333.333.333.333 Now Server 3 is always assigned the IP 333.333.333....
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1answer
381 views

Setting SMTP responses for bouncing mail

Goodday, For a mailserver i have to read all bouncing mails that my mailserver sends. When a bounce occurs i recieve a response with sometimes a SMTP error response like 550 mailbox not found. This ...
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votes
1answer
59 views

TLS for outgoing mail (following ISPmail) not working

I built my mailserver on a vserver after the ISPmail tutorial (https://workaround.org/ispmail/wheezy) (which is awesome). The only remaining problem is that it does not seem to use TLS with outgoing ...
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2answers
764 views

How to install a Mail Server on your Windows Server [closed]

I am looking to move my hosted site + email onto my Azure VPS (Windows Server 2012). I can migrate the site successfully using the @ A Name Record, but how would I go about the email? Do I need to ...
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votes
1answer
696 views

Postfix POP3 NOQUEUE: reject: RCPT error

I am getting an NOQUEUE: reject: RCPT error when trying to send mail via POP3 and Postfix (note: IMAP works fine). Feb 21 06:57:04 r2d2 dovecot: pop3(br@telecomm.com): Disconnected: Logged out top=0/...
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votes
1answer
226 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!
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1answer
2k views

MAIL FROM command from postfix to mdaemon caused 501 Domain must resolve, but not on putty

I have a strange problem with postfix. This first screenshot is captured by tcpdump on postfix. This one gave me "501 Domain must resolve" error. I tried to connect manually, and enter information ...
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votes
2answers
904 views

SMTP/HTTP/FTP status check using PHP [closed]

I am in need of a piece of code to check whether the website is alive or down . I think this can be done with php curl or fsockopen . But i do want to check whether other services like ftp, smtp, ...
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1answer
54 views

How mail transfer works between the Senders SMTP and the receivers SMTP

when I send an E-Mail it works like this: My E-Mail Client -> My SMTP -> Recipients SMTP -> Recipients E-Mail Client I know the way how my E-Mail client communicates with my SMTP but how do the SMTP ...
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votes
1answer
320 views

lost connection with smtp.strato.de[81.169.145.133] while receiving the initial server greeting

49BAC4185F 3057 Sat Mar 24 06:02:32 MAILER-DAEMON (delivery temporarily suspended: lost connection with smtp.strato.eu[81.169.145.133] while receiving the initial server greeting) 3400 mails in ...
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1answer
51 views

Will using SMTP without encryption reduce my email deliverability?

Will using SMTP without encryption mechanisms like TLS or SSL, MIME reduce email deliverability?
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1answer
410 views

Not sending encrypted messages

My mail server appears not to send encrypted mail. Image of red padlock in Gmail indicating unencrypted It seems like most of the information/tutorials focus on setting up TLS so that a client can ...
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2answers
172 views

Doesn't receive email from other mail servers [duplicate]

I really need your help. I am trying to set up first time my own mail server using Postfix, Dovecot IMAP/POP3 and MySQL backend on a Ubuntu server. I can successfully receive and send mail to my local ...
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0answers
38 views

Whitelist SMTP after hacking? [duplicate]

My Wordpress (hosted on GoDaddy) was hacked via SQL injection a few months ago. I hired a consultant to help me clean out WP and the site is functioning back to normal. Unfortunately, as part of the ...
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1answer
154 views

How domain names work in a Windows 2008R2 SMTP Server? [closed]

I'm new to SMTP servers and I'm confused because after installing my SMTP server on an EC2 instance, I was able to send emails from domains that were not mine. Here is what I did: Launch a free ...
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2answers
234 views

Postfix SMTP authentication security hole [duplicate]

I have Postfix running on CentOS 6. Everything is working ok except for a security hole in the smtp. I keep getting spam emails sent from my address to my address. I have checked this out on telnet, ...
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1answer
2k views

Explanation of various smtp error codes bounced by mailservers

I'd like to ask real mailserver administrators from here about some smtp error codes - I take care of some customer's mailing systems, and there is a wide range of server replies, many of them not ...
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2answers
73 views

Website/service that verifies if an email is valid (i.e. username exists on domain) [closed]

Given an email address I would like to not only verify the validity of the domain but also perform a lookup that checks whether or not the user's account is still active. Is this possible?
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2answers
837 views

delete spam with mailenable [closed]

I am using mailenable on my VPS server. How can I set up mailenable to checking incoming emails to my server if they are spam or not and if so, delete them?
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2answers
570 views

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 ...
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3answers
1k views

Can't connect to port 25 from all computers [closed]

I installed hMailServer on Windows Server 2003 and somehow I can't connect to SMTP 25 port from all computers. When I run the following command, it connects successfully on some clients, but on others ...
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1answer
120 views

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 ...
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votes
1answer
864 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 ...
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1answer
65 views

smtp-server privacy at work [closed]

The sys-admin at work has given me the address to the office smtp-server. At work I have to provide username/password to access it. No problems so far. In addition, at home I must connect to the ...
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4answers
2k views

Sending huge amount of emails using SMTP [closed]

I have an issue. I have situation where I need to send around 3000 emails per request using SMTP. However, only 30-40 reaches destination. Do you have any idea what can be a problem and how to solve ...
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votes
2answers
1k views

Error Code: 503 Unable to receive emails

I am running an emailing system using which I am able to send email. Of course my emails are directly moving to user's spam bin. Strange that I am unable to receive emails from any other domains. I ...
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votes
1answer
179 views

How do I set up an MTA to prevent spam relay? [closed]

I'm trying to secure my MTA against relaying spam, and am trying to understand what's involved. For example: Say I send an email using an Yahoo account to a Gmail account. When Yahoo is relaying ...
-3
votes
1answer
65 views

outbound smtp mail server, port 25

Folks, In the past, I remember having to open port 25 for email servers to check back and verify that in fact, an email was sent from an email server. Does this still pertain these days? If you ...
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votes
1answer
1k views

Unable to send mail using email client via my mail server

I have a mail server setup on Ubuntu 10.04 using postfix and dovecot. I can receive emails on email client like thunderbird, but I can send emails using the same client. Below is the postfix config ...
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votes
1answer
320 views

Disable SMTP email address validation

In Ubuntu, how can I configure an SMTP server to not check if an email address exists?
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1answer
86 views

Does anti spam software block IP addresses of large smtp providers? [closed]

Does anti spam software routinely block IP addresses of large smtp providers such as Mailchimp or SalesHandy?
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1answer
231 views

Port 457 on SMTP server?

I hope this question is valid on here, if not I apologize. I have a VPS server setup with PowerMTA and InterSpire, I just purchased the server and then I had an "expert" setup the rest. The VPS has ...
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votes
1answer
2k views

SMTP (postfix) and iPhone - can't send emails - reject: RCPT

I try to setup email server already 2 days, everything work flawless when i use roundcube on PC, I can send and receive emails, but problems start when I want to setup my email on iPhone. I can ...
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votes
1answer
108 views

How can I configure multi domain IMAPS POPS and SMTPs with single SSL Certificate

If I have 3 domains hosted on single linux based mail server that are domain1.com, domain2.com and domain3.com.and I have *.domain1.com signed ssl certificate. Is there way I can use the same single ...
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votes
1answer
3k views

How to configure exchange 2010 to be used as an external smtp relay? [closed]

I'm currently trying to configure our exchange 2010 to be used as a external smtp relay. What I'm trying to do is allow certain websites that we manage to send email using our exchange server smtp ...
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votes
1answer
39 views

Two servers mails [closed]

is that it is possible to have two mail servers in parallel, ie a primary through which mails are routed to the outside and a secondary for the exchange of mails locally. and the two servers are ...
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votes
1answer
48 views

how to run postfix by hand

I compiled postfix 2.9.5 with mysql backend.You know postfix daemons are ran with postfix, So i don't know main postfix daemon to run by hand. What's main daemon ?
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1answer
506 views

Email header analysis

I have an email header which is showing the following information, which i believe is faked. The mail purports to be from a gmail account but I'm not sure if this is the case. Ordinarily you read the ...
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votes
1answer
757 views

There was error in sending mail <xyz@xxx.com> to <abc@gmail.com> unable to establish connection smtp server to<servername:port>

I am using active perl,xampp and bugzilla install on localhost. I have my own client mail server. My bugzilla mail setting- mail_delivery_method=smtp mailfrom=new@my-domain.com Servername=mail.my-...