All Questions
63
questions
0
votes
0
answers
323
views
Can not setup postfix/dovecot with email clients
Having problems with configure postfix/dovecot with email clients such as outlook and thunderbird.
Using telnet and openssl I have tested both smtp and imap through ports 587 and 993.
Sent mails are ...
0
votes
1
answer
2k
views
Client is sending SMTP emails but they are not recorded in the "Sent" folder in webclients
I have been using instantly.ai to send emails. I connected IONOS.ca and JustHost.com mailboxes to instantly and it works fine (warmup, receiving and sending [yes other emails receive the emails sent, ...
0
votes
1
answer
457
views
Postfix: dedicated user to send emails
My current Postfix setup allows to send emails only with the local users (like, if I logged as xyz then email will be sent as [email protected]). I have Courier IMAP server, with the same user xyz but ...
- 133
0
votes
1
answer
819
views
Does email client connect to IMAP/SMTP server by resolving IP through A record or MX record?
With my limited understanding, I understand when an SMTP server sending email out, it resolves the MX record to get to the destination email server.
But what about when you setup an email account on ...
- 103
1
vote
1
answer
3k
views
IMAP and SMTP Still use Self Signed SSL even I have issued a Mail Server SSL in Cyberpanel
I using cyberpanel on CentOS 7 and I setup SSL for my postfix and dovecot. But I still got "SSL Invalid" caused the self-signed SSL even I have configure SSL using Lets Encrypt.
This is /etc/...
- 21
0
votes
1
answer
938
views
Are SMTPS and IMAPS ports really deprecated?
I've read that STARTTLS command was added and intended to deprecate the SSL ports. But even major mail servers like google still use SSL ports and even don't allow us to use classic ports with ...
-3
votes
1
answer
416
views
E-mail transmission example
RFC standards literally force us to accept unencrypted connections on port 25. To understand why, we have to understand how emailing works. But emailing is quite a complex topic and I created this ...
- 403
0
votes
2
answers
167
views
When do static files get retrieved during SMTP?
Alice is sending Bob an email message. It includes some large static content somehow. From my very basic understanding of email you can just send a HTML message, so let's say that the HTML includes an ...
- 101
0
votes
0
answers
295
views
I tried postfix restart, said service isn't running. Yet I am on my working mail server? (cent os)
So I am not sure what I am doing wrong. This all started with the need to let others from outside our network access the SMTP to send email from offsite.
So I had in /etc/postfix a check_clients ...
- 157
1
vote
1
answer
35
views
Using e-mail on malware infected computer/network [closed]
I have an important (+10 outlook accounts) but very ignorant client who refuses to accept that there is malware on the company's computers. Malware that steals Outlook data to send and receive spam. ...
- 11
0
votes
1
answer
227
views
Mail server proxy suggestions
Currently we I have a mail server for example "mail.example.com".
This is a dedicated email server and we are looking to replace it.
We are considering outsourcing the email management through ...
0
votes
1
answer
219
views
Best way to restrict/manage PHP apps to use my postfix?
I want to allow PHP apps to send mail but under very restricted conditions.
And I don't want to allow sendmail-like command for PHP apps (I'm using chrooted PHP and it's too much headache), thus I ...
- 597
-1
votes
1
answer
310
views
SPF Outlook Web App (OWA) undeliverable email
PROBLEM:
Outlook.com web app (OWA), synchronized with my local server via IMAP and SMTP(STARTTLS), returns "Undeliverable message" for all messages sent.
PROPOSAL: (rejected)
This returning message ...
2
votes
0
answers
1k
views
HAProxy - IMAP, SMTP, POP3 - Multiple Servers
Please accept my apologies if this is off topic or does not apply on a more broad scale (i've searched the internet and can't seem to find a solution anywhere). I'm not sure if this is even possible, ...
- 33
2
votes
3
answers
4k
views
Are CNAME "imap..." and "smtp..." subdomains needed?
I'm running my Postfix email server. I have only 1 A dns record for it: mail.my_domain.com I'm able to connect to it, receive and send email through it using only this url. Namely, I don't have "smtp.....
- 23