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$smtp->auth( $user, $pass,'PLAIN') || die "cannot do mail auth";

 perl ./FHEM/sendEmail.pm
Net::SMTPS>>> Net::SMTPS(0.09)
...
Net::SMTPS=GLOB(0x55ffcc1839b0)>>> AUTH-server offerred: PLAIN LOGIN C
+RAM-MD5 DIGEST-MD5
Net::SMTPS=GLOB(0x55ffcc1839b0)>>> AUTH-negotiated: PLAIN
cannot do mail auth at ./FHEM/sendEmail.pm line 18.

$smtp->auth( $user, $pass,'LOGIN') || die "cannot do mail auth";

 perl ./FHEM/sendEmail.pm
Net::SMTPS>>> Net::SMTPS(0.09)
...
Net::SMTPS=GLOB(0x56154bf1cf60)>>> AUTH-server offerred: PLAIN LOGIN C
+RAM-MD5 DIGEST-MD5
Net::SMTPS=GLOB(0x56154bf1cf60)>>> AUTH-negotiated: LOGIN
cannot do mail auth at ./FHEM/sendEmail.pm line 18.