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https://serverfault.com/questions/470649/how-can-e-mail-be-delivered-to-a-domain-without-an-mx-record
https://community.spiceworks.com/topic/452073-sending-email-to-recipient-with-no-mx-record
Mar 03, 2014 · Well, if you have access to your own mail server or your mail server's dns servers, you can spoof any address you want. You can add a mx record for the ip address that you are tying to send to in your dns server or you can use the hosts file on the exchange server to spoof the mx record for the ip (not sure about this second option, as I've never tried to spoof a mx record with a hosts file ...
https://www.zoho.com/mail/help/adminconsole/configure-email-delivery.html
Configure Email Delivery - Update MX records Once you have verified your domain and create users, you will be able to send emails from domain-based accounts. However, you will not be able to receive emails until you configure the MX records for your domain.
https://www.rackaid.com/blog/email-dns-records/
Mar 28, 2017 · The 3 DNS Records you must know for good email delivery are: Reverse DNS (PTR) SPF (Sender Policy Framework) DKIM (DomainKeys Identified Mail) These are the 3 DNS records you must have correct for sending email reliably. Of course, you need an MX record if you want to receive email, but that’s another topic. Reverse DNS Records
https://smtp25.blogspot.com/2007/07/can-you-run-mail-server-without-mx.html
Jul 20, 2007 · Now your Exchange server (mail server) will try to establish SMTP connection to all records up here Before, your Mail server queuing the mail IF there is no MX record exists, on ISP DNS servers, Bases on RFC 2821 http://tools.ietf.org/html/rfc2821
https://mxtoolbox.com/deliverability
about email deliverability This tool requires you to send a test message to MxToolbox. Our systems analyze the headers, the blacklist reputation of your outbound IP address, and your SPF records to generate a comprehensive deliverability report.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/mail-flow-best-practices
Feb 07, 2020 · In Office 365 mail flow, there are several components of DNS that are particularly important for email authentication and delivery: MX records, SPF, DKIM, and DMARC. MX (mail exchanger) records provide an easy way for mail servers to know where to send email. You can think of the MX record as a type of postal address.
https://practical365.com/exchange-server/mx-record/
Aug 06, 2011 · To answer your question, you just need to point an MX record for an email domain (any email domain, a test one is fine as long as you configure Exchange 2013 to accept it) to your public IP and NAT that IP to your Exchange 2013 server for port TCP 25.
The MX lookup is done directly against the domain's authoritative name server, so changes to MX Records should show up instantly. You can click Diagnostics , which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay …
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