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5

As shown in your graphic, no protocol that exists "between" SMTP and POP3. SMTP is responsible for moving the message from the sending computer to the recipient's mail server. If there are multiple servers involved in moving the message from the sender's server to the recipient's server, each one moves the message via the SMTP protocol. These in-between ...


3

This is because you are likely using a dynamic 'consumer' IP from your ISP. Most of these are blacklisted on Barracuda and similar RBL's due to various malware and spam sent over them without most users knowing (which is one of the many reasons you should use a static IP for any business needs.) You can try and get the IP removed but it will be wasted ...


2

In this regard, a Shared mailbox is no different from an ordinary User mailbox, you can add additional email addresses just the same: Set-Mailbox "foo2@example.com" -EmailAddresses @{add="foo@subdomain.example.com"} If the email address is being removed due to Automatic email address policy updates, you can disable address policies for the mailbox: ...


1

This is a mostly client-side question, unfortunately, as there isn't a standard server-side solution to storing address books (though IMAP folders can effectively store arbitrary data, so if everybody agreed on an addressbook format, we could all stick them in IMAP folders). Thunderbird can be configured to share an address book via a variety of methods, ...


1

What you are talking about is referred to as SMTP namespace sharing. If the mail systems support it and you know how to configure it, yes. Otherwise, you'd have to do some tricky mail forwarding to a fake domain and then change outbound addresses to the right SMTP domain which gets complex and frustrating.


1

The MX record must point to the SMTP server handling incoming mails. So when you ask the question whether the MX record should point to the outgoing SMTP server, the POP3 server or both, then the answer is no. Obviously the POP3 server and the incoming SMTP server must be somehow tied to each other, but they don't have to be on the same IP. If they are on ...


1

You need to configure the reverse DNS (PTR) records for your elastic IPs by filling out this form. Make sure your A records are correct or they will not create the PTR record.


1

sendmail.mc errors after upgrade sendmail.mc:18: m4: cannot open `/usr/share/sendmail-cf/ostype/linux-gnu.m4': No such file or directory Your sendmail.mc file is buggy. It contains OSTYPE(linux-gnu) directive without support for linux-gnu parameter for OSTYPE. You get the above error message when sendmail package regenerates/recompiles sendmail.mc into ...



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