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Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

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I was just at a conference on Business Email Compromise (BEC).  various ISACs, Symantec, the FBI and the CIA presented.  It was very informative and here are a few things that were mentioned

  • Watch out for fraudulent scams involving IRS returns
  • Put 2FA in place everywhere you can and put a 2 factor policy in place for wire transfers
  • If you believe your GMAIL account may have been compromised, or just wish to keep an eye on it, there is a link on the bottom of the page to see the last 10 logins (although I don't see this in inbox, maybe it is only in gmail).
  • Set your out of Office messages to be internal only - or force this using rules
  • Use something like
  • DMARC

These were just some of the points made, but they were good ones.
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linux email relay has stopped working

in the log it reads
Oct  9 07:46:15 culser postfix/smtp[18330]: 21FE619C627: to=<circleconect@gmail.com>, relay=smtp.rcn.com[69.168.97.78]:25, delay=0.44, delays=0.03/0.01/0.26/0.15, dsn=5.7.1, status=bounced (host smtp.rcn.com[69.168.97.78] said: 554 5.7.1 [P4] Message blocked due to spam content in the message. (in reply to end of DATA command))

the relay i am using in postfix is the smtp address. i am getting a 554 error apparently. i pay for IP service thur them but they say they have no restriction. maybe it is a setting in postfix s

i need someone's advise who has knowledge of Linux, postfix, relays, and email servers.
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LVL 6

Expert Comment

by:Prabhin MP
I HOPE YOU GOT THE ANSWER
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Author Comment

by:culser
yes it now works.
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Hello Team, i need a need a calendar solution that can be shared by the entire office. I want different people to be able to view, access and edit the same calendar data across networks.
Which is the best solution for this ?
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LVL 55

Expert Comment

by:Scott Fell, EE MVE
Lee, you will get a better response if you ask a question.  Just click on the blue Ask a Question button at the top.

Scott
Topic Advisor
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Expert Comment

by:Erik Dick
Google calendar is your best bet everyone can submit and edit to it. You can also have meeting rooms as users so no one double books.
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Lesson learned this weekend: when doing a cut-over migration to Office 365 Exchange online, make sure you don't have existing users in Office 365,   Migration will refuse to provision the users as duplicates (seems like a bug to me).
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LVL 59

Author Comment

by:Jim Dettman (Microsoft MVP/ EE MVE)
hum, still getting all comments.

We'll make this a long one

by spacing out some lines

and so forth.

and talking a lot about nothing.

just some hot air

can't wait for the balloon fest
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LVL 7

Expert Comment

by:Brian Matis
Ha! Nice experimenting :-)
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Email Servers

24K

Solutions

21K

Contributors

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

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