Questions tagged [smtp]

Simple Mail Transfer Protocol is the protocol used for sending email.

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11 views

How to handle notification mail routing for separated mail and web hosting?

We have a shared web hosting service on one provider and email (MX) hosted on Outlook365. As it's a turnkey service, the smtpd with our webhosting is set up for the same domain. This causes me a ...
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Telnet to Gmail SMTP “starttls auth” syntax error

When I Telnet gmail and send an email using cmd promt, everything works fine. After Telnet smtp.gmail.com 587, following conversation with the server happens: 220 smtp.gmail.com ESMTP m184sm839913wme....
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How to filter email originating from @domain.com on Exim4?

I'm trying to implement a basic phishing protection on our Exim4 email relay. The way we have our mail delivery setup is following: external hosted smtp server -> exim4 relay -> Exchange server ...
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SMTP outbound queue for Windows Server 2016

Many of our applications send email via SMTP. We use AWS SES via SMTP to do this. We periodically hit stretches when we get timeouts from the SMTP server while sending. Instead of writing a queue ...
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2answers
24 views

How set Default vs. specific outgoing server

I am using Thunderbird 78.9.1 and Win7. I have a few email accounts that are associated with my own web site. In TB: Tools | Account Settings | Outgoing Server (SMTP) I have 3 entries: ...
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How to analyze why an email was misdirected?

I received an email from someone I know and relating to a club we both belong to so I'm confident it is not harmful, but in my limited knowledge of email headers I can't tell why I received it as it ...
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What is the difference between Gmail SMTP port 465 and 587 in Mutt?

Which Gmail SMTP port should I use in Mutt's smtp_url configuration option? I noticed that port 465 only works with smpts://..., while port 587 only works with smtp://... (by "works", I mean ...
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Setting up PTR SMTP rDNS

I have setup a domain in a dedicated server for sending mass-mail everything seems to be ok, I can send no problem... everything seems to be ok, BUT!... the server is has been set up with a primary ...
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My e-mail is being used to send spam, what can I do?

I am renting my own domain from a German hoster, and have created 4 e-mail accounts on it. All was well for 5+ years. For about a week now, one of those accounts receives around 5 e-mails per day from ...
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43 views

A weird issue with an e-mail

I'm having a really weird problem with my e-mail account. I've been using MS Outlook 2019 for a year now without any problem. Suddenly, I realized I wasn't able to send my e-mails, although I hadn't ...
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difference between nc and telnet using smtp service as an example

I can use both nc and telnet to connect to port 25. $ nc 192.168.1.120 25 220 localhost ESMTP Exim 4.68 Tue, 29 Dec 2020 06:07:27 +0000 $ telnet 192.168.1.120 25 Trying 192.168.1.120... Connected to ...
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How are the FTP, SMTP, SSH ports used?

I know these are three questions, but I put them together because I think one connects with the other. I understand that when you want to send an email it's done using the SMTP protocol. Now port 25 ...
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1k views

Gmail SMTP Errors and False Positives: “The email account that you tried to reach does not exist”

Since earlier today, I've been receiving notification from Gmail SMTP alerting to "hard bounces", but the gmail addresses are valid and messages are NOT being delivered. Here's an example of ...
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How to temporarily disable accounts in outlook (pop3 & smtp)

One can easily disable pop3 accounts in outlook (2019) by not including the account in a send/receive group. However, this still attempts to connect to the account's smtp server. When an email ...
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Can't receive email to additional account added in Apple Mail - Error 550 5.1.10 in Exchange Online

I'm trying to add an additional SMTP account to someone's apple Mail program. They can send emails fine, but when I try to send them an email I get: "Your message to x@y.com couldn't be delivered....
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63 views

Thunderbird - Error: Can't add a login with null or empty password

On my Windows 10 Outlook keeps asking for SMTP login which 100% works (tested in Browser) and it did work in the past. Thunderbird same issue and the thunderbird error console gives me this error &...
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Forward email to a new email account when the provider doesnt support forwarding

I want to gradually move from my primary email address that I use everywhere, to a new email with my own domain. Because this will a while to move all my accounts to this new email, I wanted to ...
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Is Dovecot Active?

I am attempting to set up a Postfix / Dovecot mail server and although Webmin reports that Dovecot has started OK at the command line I enter service dovecot status and I get the following back which ...
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I am setting up Raspberry Pi as cctv camera. Trying to setup email service to send videos to my gmail

I have successfully setup Postfix as a SMTP server and add the service to my gmail with App Passwords. This is working and I am able to send emails using sendmail command. But there is no attachment ...
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why is inbound traffic on port 25 blocked by default and not just outbound?

I'm on Comcast (Xfinity) and as such have port 25 blocked. I understand blocking port 25 for residential connections is an important part in the anti-spam fight vs. botnets. What I don't understand is ...
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How is it that Email Marketing Platforms like mailchimp are able send emails from me without me giving them my email password?

Mail Chimp, SendinBlue, and etc are email marketing platforms that can do email blasting. I noticed that they are able to send an email and mark it as 'From' my email. Its very weird to me as i never ...
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26 views

open ports or not? language problems

community, I do not really have a technical question but rather a comprehension one. I try to set up my own mail server as a private project on a hetzner cloud server, using ubuntu 20.04 and their UFW....
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Why does a mail header report a different hostname from the configured in the mail server

When I send an mail to Hotmail using the SMTP server mail.example.com and then when I received it and see the original message, I can see this in the header: helo=vps.example.com; Received: from vps....
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How to change hostname in Exim greetings

currently, exim is greeting with: 220-vps.example.com ESMTP Exim 4.93 #2 Wed, 07 Oct 2020 15:02:03 -0300 I want it to be: 220-mail.example.com ESMTP Exim 4.93 #2 Wed, 07 Oct 2020 15:02:03 -0300 I ...
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On Windows, how do I make it so that any connection to “imap.gmail.com” & “smtp.gmail.com” use a specific network interface?

After many years of searching, asking and hoping, I've now given up 100% on ever being able to specify this in PHP for imap_open() and PHPMailer. They simply don't feature this, nor the ability to set ...
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68 views

Is it practical to run a private SMTP server on a static IP in 2020/2021?

I have a small piece of static IP4 space (5 IPs, /29) and general Linux sysadmin capabilities. I have run SMTP servers before, but I don't know what the current state-of-the-art for email and spam-...
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251 views

SMTP server somecompany-com.mail.protection.outlook.com

My understanding is that if you are an office365 customer and your email is like you@your-company.com You would get an SMTP server like your-company-com.mail.protection.outlook.com Then you would be ...
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Postfix SMTP Relay for Multiple Mailboxes

I currently have a local postfix server configured with an Office 365 SMTP relay. The configuration makes use of SASL and uses sender_canonical to rewrite the address. The server receives mail from ...
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11k views

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required

I'm attempting to send email using G Suite's SMTP relay service. Using C#, my code snippet looks like this: string message = "<em>It's great to use HTML in mail!!</em>" var ...
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Sending email through GMail SMTP server sending copy to sending address inbox

We have a web application that is sending emails on behalf of one of our clients and using their Gsuite SMTP account. They are complaining that they are getting copies of every email our app is ...
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Setting up HP MFP M277 dw scan to mail (with synology mail server for smtp)

I have a HP MFP277dw color laserprinter that should be able to scan to mail. The printer requires an smtp server to send this mail. Therefore I installed the synology mail server package on the NAS. ...
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sending an email via multiple mail servers?

We know that SMTP is used to send email as picture below shows: So it seems that two mail servers are involved. But I had a look at header of an e-mail message, there are fours Received: header lines,...
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Cannot send email to SMTP server from Zabbix - “550 5.7.54 SMTP; Unable to relay”

I try to send Email notification from Zabbix to SMTP server but show this message: ‍‍‍wrong answer on RCPT TO "550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain" For Example: ...
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Get access to all settings for my email account setting in Outlook 365 (SMTP FROM address)

I have an email address from my church administrator@my-church-url.de. This emails are forwarded to a private mail address. churchadmin@my-private-url.de. In my Outlook 365 I can create an IMAP ...
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46 views

Postfix relay some domains only from some senders

I try to relay some email from my postix server like that : First if the email is from a specific sender and the destination is in a list of domains, i relay to another smtp If the email is for anyone ...
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2answers
56 views

Mail movement to subfolder not being reflected in Outlook (IMAP client) when moving mail via another Email SMTP service

When I move mail using SMTP service of some application to inbox's subfolder, the mail is still being shown in inbox in Outlook mailbox which I have configured through IMAP protocol. Why the same is ...
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Which IP address does SPF validate?

Should SPF validate the SMTP server address or the home PC address? I have a situation where a home PC is sending mail through the ISP's SMTP server. The email address has a personal domain, used only ...
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1answer
119 views

Postfix: Allow sending only from virtual users used by dovecot

So I have set up my postfix server with dovecot according to this tutorial. Receiving emails works fine, sending them too. But these days I had the problem that my postfix started sending emails from ...
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1answer
302 views

Configure MailEnable for SSL error: Server does not support secure connections

I send emails from my Windows Server 2016 VPS via mailhost localhost, using MailEnable. using this code it all works: Dim mailObj As New SmtpClient mailObj.Host = "localhost" mailObj.Port = ...
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Outlook does not send out emails via SMTP (no error message)

Outlook 365 (business pro) can not send out Emails via SMTP. The server and user settings are correct: emails are being received and the testemails sent by outlook upon setting up the SMTP server is ...
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1answer
38 views

Mail Header Hostname/Computer name if behind VPN

When sending mail with a native mail client like Outlook, my hostname is part of the mail header (Received from). I would like to know if this hostname is also shown if I am connected to a VPN or if ...
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RSET code: Continuous polling of my SMTP server dangerous?

I'm getting a ton of logentries like below for my MailEnable server on my VPS. I see there's a lot of invalid username or password messages in there, so I presume it's bots trying to access my server. ...
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34 views

RHEL 5, where is the SMTP configuration?

I'm trying to change the SMTP settings of some of my RHEL5 servers as this servers are sending email via an exchange server which block any outgoing mail to external email IDs. Since changing the ...
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1answer
207 views

What port does windows 10 Mail app use for smtp server by default?

If I do not add a port after the SMTP server, what port does Windows 10 Mail use by default, 465, 587, or 25? I checked on all the options including "Require SSL for outgoing email".
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33 views

Port Sharing Issue

Recently I started experimenting with an email server hosted on a device on my own private network. The above mentioned server required me to open up ports on the router hiding everything. As soon as ...
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1answer
182 views

Obtain Message-ID: header of sent mail in Outlook

Assuming a vanilla POP3 account in Outlook, how does one get the Message-ID: header of sent email? Alternatively, the raw MIME object as submitted to the SMTP server would be equally valuable. E. g. ...
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511 views

Gmail can't authenticate Office 365 Address via SMTP

Custom Domain registered through GoDaddy Office 365 email purchased through GoDaddy Trying to send / receive email for this address using free Gmail (not G suite) I have reviewed every resource I can ...
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48 views

How do I reset my SMTP password?

After working for about three weeks, I finally got back the Thunderbird account that I thought was lost. Everything is fine except sending emails. Every time I send an email, a password is requested ...
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SMTP-Docker not sending emails, what am I doing wrong?

Please bear with me, as I only started out with Docker a couple fo days ago. I created a brand new VM with CentOS 7 in our ESXi server. Setup Docker and Portainer with no issues. I wanted to create ...
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1answer
1k views

cURL: How do I set the email subject when using -F (multipart / attachment)

I'm trying to send an email using cURL. It has to include an attachment, so I'm using the -F / --form option: (it's a single line, but I wrote here this way for clarificaiton) curl smtp://smtp....

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