Questions tagged [smtp]

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

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Ubuntu, IPv6, multihome, e-mail, source selection. Arghhh

I've been hosting my e-mail forever, and have been also using IPv6 via 6o4 (HE) for some time. Here (South America) IPv6 has been slow in acceptance, so to say, so everything went fine until now. Now ...
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Alternative way to Interact with Microsoft Office 365 server

My workplace has an Microsoft Office 365 and an "Outlook only" design philosophy wrt e-mail clients. As a long-standing user of emacs and mu I find the idea of using Outlook unbearable. I ...
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Google bounce email with error 550-5.7.1 Our system has detected that this message is likely unsolicited mail

I have a forward configuration in my Exim4 server, when it receives a message to a particular address, it is forwarded to a gmail account. Exim4 is configured with a valid DKIM and SPF authentication ...
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Why can't I send email from Thunderbird using an office365 account?

I have been struggling to set up Thunderbird to use an office365 account. Receiving was fine, as was managing my mailbox, but it simply refused to send, despite having all of the right settings: smtp....
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How to get Postfix and Dovecot working with an existing Kerberos realm?

I now have a Kerberos realm like MYDOMAIN.CH, an admin server and a principal of root/admin, as well as the realm master password and the root/admin principal password. Now I want to get Kerberos ...
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Outgoing emails are not signing with DKIM

I have set up Postfix and OpenDKIM and I am trying to get outgoing emails signed by DKIM so that providers won't mark it as spam. However, even if I believe I set up the signing properly, none of the ...
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Outlook send only account

How can I set up a send-only account in Outlook 356 (on Windows)? I only have SMTP login information. There is simply no IMAP/POP3 server to log in to. I've tried this: https://nolongerset.com/send-...
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Two-piece mail server, working out sender_login and verified_recipient validation

TL:DR I'm trying to figure out how to get one postfix server to ask another whether a incoming email's recipient address is valid, or if an outgoing email's sender address is a valid email/alias for ...
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Possible to configure my VPS as a proxy of mail sent by another mail server?

I have a NAS which deployed with a full-featured mail server, but I cannot send mail to most of the other mailboxes because its IP is always blocked from sending mail, and the mail sent will be ...
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Possible to host a SMTP relay on Linux?

Let's make it brief. I have a NAS with mail server on it and a VPS, but I cannot send mail directly because the IP of the NAS is defaulty rejected by all, any mail sent will be returned. But the IP of ...
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How to set up local mail on AWS linux 2

ISTR that in the old days, on most unix boxes you could just mail someone ... and it pretty much just worked. I have a pretty decent understanding of how mail servers work, but ... it turns out I don'...
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Outlook Exchange account view raw NDR report

Office 365 / Outlook I am interested in viewing the raw NDR report from a bounced message. The NDR from postmaster seems to be a special type of email, or Outlook is treating it differently. The NDR ...
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Unable to telnet to 127.0.0.1 (local Linux VM) to test SMTP port 25

I have the latest Kali Linux running on Hyper-V as a VM: Sendmail is installed (testing email server) Domain name purchased, say AlphaMoon.org with MX record pointing to my ISP IP address Netstat ...
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SMTP always fail on first attempt

I tried PowerShell to test SMTP, but the first attempt or first few attempts will always fail and receive the same error Send-MailMessage : Unable to read data from the transport connection: ...
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Outlook password encoding for email services (IMAP, SMTP)

I’m trying to make sense of how different mail clients log onto IMAP and SMTP services. There are the normal ones and then there is Outlook. Outlook seems to unconditionally encode passwords as Latin-...
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Can't send mails as root with Mutt through MSTP

I successfully set up Mutt and SMPT to send to myself some logs through emails. As user, it works perfectly However, when I ask through sudo crontab -e as root to send some logs after running some ...
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POP3 + Mail client = no new messages on server (despite having new messages on server)

I'm using Thunderbird. I've used it forever. Today I noticed mail wasn't being delivered for about 2 days; after checking the usual suspects and confirming I see new mail in my server account's /var/...
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Office365 SMTP server extremely slow from Thunderbird on Linux

I've been using Thunderbird on Linux to access the Office365 email account of my company. Starting from last week, connections suddenly became extremely slow. I regularly wait for 3 to 5 minutes ...
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Send a MIME Email with PUTTY

Im currently wondering how to send a mime mail with putty, important is, for now i only want to "declare" the mail as a mime mail if thats possible. I dont want to send an actual picture,...
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How to interpret specific SMTP responses

I've been having a terrible problem sending emails from a godadddy shared-hosting (CPANEL) email account to any email account hosted by Network Solutions. I have spent hours on the phone with ...
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SMTP server to redirect to another SMTP server

I'm trying to make it so I can send emails using my student email address from my primary email account. My school has set up a SMTP server we can use. However, my primary email account is Protonmail ...
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Postfix not sending to gmail [added spf & dkim]

Hello i've been struggling for a while now. I will give all the details i can. OS: Ubuntu 20.04 Server: DigitalOcean (Droplet) Domain Registrar: Namecheap I hope i did not change up somethings with ...
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Postfix: inbound and outbound relay with store and forward - advice needed

My ISP blocks port 25, so I'd like to setup a store and forward inbound and outbound postfix server (relay-server) that communicates with a mailstore server (mailstore-server), which is unable to ...
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Telnet port 587

Our IIS hosted system sends Email through an account [email protected]. Sometime ago, my ISP blocked port 25 so it stopped sending, talking to my email provider GoDaddy, they said I can use port 587. ...
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Run Mercury on Xampp portable

I do use xampp-portable-windows-x64-8.0.3-0-VS16. But Mercury was disabled and \xampp\MercuryMail\ folder was empty. So I copied files from install version and enabled Mercury in xampp-controll.ini. ...
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Configure postfix for external SMTP

I have a PC at home with Manjaro, connected to the internet through a MODEM that an "internet service provider" has installed for me, from which optical fiber goes out to the world. My ...
cefer's user avatar
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Difference between SMTPd and SMTP

Hi can someone tell me what is the difference between the SMTPd and SMTP ?? i found that smtp is Postfix SMTP client and smtpd is Postfix SMTP server is this real ??? I found other information : ...
Rayen Ben Said's user avatar
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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 ...
Salamander's user avatar
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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: ...
xstack's user avatar
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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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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 ...
Alexander Engelhardt's user avatar
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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 ...
learn123456's user avatar
1 vote
1 answer
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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 ...
Pedro Lobito's user avatar
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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 ...
Jimmy's user avatar
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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 [email protected] couldn't be delivered....
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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 &...
CodingYourLife's user avatar
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1 answer
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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 ...
brpaz's user avatar
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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 ...
user1034912's user avatar
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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....
Calumeth's user avatar
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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 ...
Pete S.'s user avatar
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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-...
Dave M.'s user avatar
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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 ...
sapbucket's user avatar
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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 ...
crichavin's user avatar
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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,...
amjad's user avatar
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1 answer
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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 [email protected]. This emails are forwarded to a private mail address. [email protected]. In my Outlook 365 I can create an IMAP ...
xMRi's user avatar
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2 answers
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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 ...
Raghav Gupta's user avatar
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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 ...
William Morris's user avatar

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