All Questions
221
questions
0
votes
1
answer
284
views
Internal Address Spoofing using Outlook SMTP Server
Is there a way to harden Exchange Online to prevent spoofing of internal addresses using SMTP?
For example, if I connect to Outlook's SMTP server and issue the following commands:
HELO domain.com
MAIL ...
j4k3
2
votes
2
answers
698
views
Slow SMTP responses with Exchange 2013 (Not network infra related)
(I know 2013 is shortly out of support, and it will be replaced, but in the interim, I'm experiencing an issue I would like to fix.)
I will use telnet over port 25 as my example, but normal traffic ...
- 29
0
votes
1
answer
86
views
SMTP hub or redirector, is this possible?
Situation:
I need to be able to set one SMTP server set of details into some software that sends out emails. However, the software sends emails from many different sender domains, all hosted on ...
0
votes
1
answer
5k
views
Error sending email with Office 365
My company has Office 365.
We use account for send email (SMTP/SSL)
https://www.gmass.co/blog/office365-smtp/#office
We get error similar like this, but using Exchange Online
https://docs.microsoft....
- 143
1
vote
2
answers
5k
views
How to send an email with openssl and Microsoft Exchange Online?
With Microsoft disabling basic auth in Exchange Online, I set out to add support Modern Authentication in our application. Our app sends basic email alerts. Currently we use SMTP basic auth or open ...
- 61
1
vote
1
answer
5k
views
Enable SMTP Port 587 instead of Port 25
Through my Office365 subscription, I have an SMTP relay, ‘contoso-com.mail.outlook.com’. Currently this only accepts traffic on port 25
I want to look at setting up port 587 with TLS encryption, but ...
- 11
0
votes
1
answer
3k
views
MS Exchange: How to enable SMTP to use OAUTH2.0 but with basic AUTH disabled
(I have asked this question also on stackoverflow but I now think that this might be a more useful community to ask hence I am also posting here.)
I am trying to know whether it is possible to enable ...
1
vote
2
answers
2k
views
Delivering smtp mail from postfix to exchange and online exchange problam
I have a very strange problem with one server01 its smtp notifications mail.
My scenario: server01 sends mails over postfix to local on-prem exchange server. That mail is correct with to: address, ...
- 11
0
votes
1
answer
225
views
Exchange Server Cannot Receive External Email From Postfix Relay
Server A = Exchange Server (mail.example.com)
Server B = SMTP Server on VPS (smtp.example.com)
I use 2 separate servers to build my Mail Server because of my ISP block Server A port 25
So the ...
0
votes
1
answer
201
views
Postfix Relay Loops Back To Myself
I have 2 servers, let me illustration like this:
Server A = Exchange Server (mail.fendyfy.com)
Server B = SMTP Server (Postfix) on VPS (smtp.fendyfy.com)
I want my server A to fully Send&Receive ...
0
votes
1
answer
353
views
Exchange Server Smart Host not working
I have 2 Server, let me illustration like this
Server A = Exchange Server
Server B = SMTP Server(Postfix) on VPS
I want my Server A fully Sending&Receiving Email from Server B(Because Server A ...
0
votes
1
answer
404
views
Can I send a mail through Exchange Online with a different reply name and reply address than what I am authenticating with?
Just switched to Exchange Online, and ran into an issue. We have an application that lets an employee email a customer. With our previous mail provider, we would authenticate to the SMTP server using ...
- 387
0
votes
2
answers
1k
views
Exchange server redirect email to another smtp
Does anyone know if it's possible to redirect email received to Exchange server 2016 to external SMTP MTA?
For example everything received from domain.com to be redirected to encryption gateway. So ...
- 1
0
votes
1
answer
134
views
forwarding eMails from exchange misses sender address
when forwarding eMails from Exchange to Icewarp, there is nop sender address displayed in icewarp.
Even in the code of the eMail there is a from-address, there is no from address shown in smtp log.
...
- 301
0
votes
3
answers
604
views
Forwarding eMails from Exchange to Icewarp bounces back, but not via distribution list
we are testing heavily Icvewarp as replacement for our outdated Exchange.
Unfortunatly there is nearly no docu around in the internet, which makes it not easy :-(
We have now set up the Icewarp ...
- 301