Faruque Ahmed : MCP, MCSA, MCSE, MCTS, MCIT, CCNA, OCA, OCP, GCP

DNS Tips

https://mxtoolbox.com/DMARCRecordGenerator.aspx

https://www.alitajran.com/configure-dmarc-record-for-office-365/

-------------------DKIM------------------------------

https://mxtoolbox.com/NetworkTools.aspx

https://mxtoolbox.com/dkim.aspx

google._domainkey.easydmarc.us
google._domainkey.urmigroup.neturmigroup.net:google
selector1._domainkey.selbn.comselbn.com:selector1

Show own IP Address Linux

[root@mail ~]# dig +short myip.opendns.com @resolver1.opendns.com

202.22.199.150

DMARC Record Generator

https://easydmarc.com/tools/dmarc-record-generator

DMARK: DNS entry: TXT

Name: _dmarc

Content: v=DMARC1; p=none; rua=mailto:faruq@worldcm.net

Name: _dmarcValue: v=DMARC1;p=none;

v=DMARC1; p=reject; rua=mailto:postmaster@worldcm.net, mailto:dmarc@worldcm.net; pct=100; adkim=s; aspf=s

---------------------------------

C:\Users\FaruQ>nslookupDefault Server: UnKnownAddress: 156.154.70.22
> set type=a> selex01.worldcm.netServer: UnKnownAddress: 156.154.70.22
Non-authoritative answer:Name: selex01.worldcm.netAddress: 115.129.47.195
> selex02.worldcm.netServer: UnKnownAddress: 156.154.70.22
Non-authoritative answer:Name: selex02.worldcm.netAddress: 275.229.247.194
> set type=mx> worldcm.netServer: UnKnownAddress: 156.154.70.22
Non-authoritative answer:worldcm.net MX preference = 10, mail exchanger = spam.metro.net.bdworldcm.net MX preference = 0, mail exchanger = selbn-com.mail.protection.outlook.com> set type=txt> worldcm.netServer: UnKnownAddress: 156.154.70.22
Non-authoritative answer:worldcm.net text =
"v=spf1 include:spf.protection.outlook.com -all">

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