Error: "550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF bcsonline.org.in with ip 137.74.217.88 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information." while connected from uranus.streamad.in (137.74.217.88) to mx-apac.mail.gm0.yahoodns.net (106.10.248.74)
2026-04-04 18:03:22
Error: "550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF bcsonline.org.in with ip 137.74.217.88 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information." while connected from uranus.streamad.in (137.74.217.88) to mx-apac.mail.gm0.yahoodns.net (106.10.248.74)
smtp;550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF bcsonline.org.in with ip 137.74.217.88 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information.
bounced
2026-04-04 18:03:22
137.74.217.88
jjitender24@yahoo.in
mx-apac.mail.gm0.yahoodns.net (106.10.248.74)
smtp;550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF bcsonline.org.in with ip 137.74.217.88 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information.