Email Authentication

trello.com

SPF

pass
Declares which servers may send mail for this domain.
v=spf1 include:_spf.google.com include:_spf.salesforce.com include:spemail.trello.com include:cust-spf.exacttarget.com include:amazonses.com -all

DKIM

fail
Cryptographic signature on outbound mail (selector: default).
v=spf1 -all

DMARC

pass
Tells receivers what to do with mail that fails SPF/DKIM. Policy: reject.
v=DMARC1; p=reject; sp=quarantine; adkim=r; aspf=r; fo=1; pct=100; rua=mailto:dmarc_rua@emaildefense.proofpoint.com,mailto:dmarc-rua@abuse.atlassian.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com,mailto:dmarc-ruf@abuse.atlassian.com;

Mail Servers (MX)

10 mxb-001d9801.gslb.pphosted.com
10 mxa-001d9801.gslb.pphosted.com