Hello everyone.
Messages from sender user@gup.energy.crimea.ru are rejected by Sender Id Agent. Reason is "MissingPRA". Sender IP address is:178.34.185.158.
But according to mxtoolbox.com and nslookup SPF-record for this domain is correct and IP address mentioned below is permitted to send messages for this domain.
May be there is something not-obvious in Sender Id Agent altorithm?
Details (Get-AgentLog):
SessionId : 08D3F9E31C32B3F5
IPAddress : 178.34.185.158
MessageId :
P1FromAddress : user@gup.energy.crimea.ru
P2FromAddresses : {user@gup.energy.crimea.ru}
Recipients : {user@domain.ru}
Agent : Sender Id Agent
Event : OnEndOfHeaders
Action : RejectMessage
SmtpResponse : 550 5.7.1 Missing purported responsible address
Reason : MissingPRA
ReasonData : No valid PRA
Diagnostics :
NetworkMsgID : 00000000-0000-0000-0000-000000000000
TenantID : 00000000-0000-0000-0000-000000000000