>1- Each domain can have a MX record? If you want to receive email for this domain then yes, you should have an MX record for it. Without it "A" record will be used, but it is better to have MX.
>2- If a company need multi MX record then it must have multi DNS server too? You can have multiple MX records with different priorities. Sender's MTA will try first one first. Number of DNS servers doesn't affect the number of MX records: in most cases all public servers must have the same records. >3- Other methods like forwarding need MX record too? No, if you only want to send email, you are not required to have an MX record. Some MTAs may decline messages from domains without of MX, but most of them accept such mails. But if you have no MX, then you can't get replies and non delivery reports. There are some books about Postfix: "The book of Postfix", "Postfix: The Definitive Guide". It may be a good idea to read some of them: they cover how postfix works with DNS and MX. On Tue, Oct 13, 2020 at 10:15 PM Jason Long <hack3r...@yahoo.com> wrote: > I'm really thankful for all information and help. > Excuse me, I have some questions and I'm thankful if anyone answer to them > by number: > 1- Each domain can have a MX record? > 2- If a company need multi MX record then it must have multi DNS server > too? > 3- Other methods like forwarding need MX record too? > > Thank you. > > > Sent from Yahoo Mail on Android > <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> > > On Tue, Oct 13, 2020 at 10:12 PM, @lbutlr > <krem...@kreme.com> wrote: > On 13 Oct 2020, at 12:03, Fred Morris <m3...@m3047.net> wrote: > > > Notwithstanding, any "fully qualified domain name" (FQDN) can have email > sent to it; typically only the FQDN immediately below the zone cut, and > also the subject of SOA and NS records, has MX records. > > > Pretty sure it is prefect fine to have different MX records for subdomains. > > example.com MX 10 mail.example.com. > foo MX 10 mail.sub1.example.com. > Bar MX 10 mail.sub2.example.com. > > Universities used to often have different MX servers for different > departments/machines, though now it seems they are using external services > for MX (maybe lucky, I checked five and all were using google or outlook > for MX). > > -- > "Are you pondering what I'm pondering?" > "I think so, Brain, but Tuesday Weld isn't a complete sentence." > >
