My headless pi has been sending emails to my normal account from it
and its companion headless pi for well over a year. They are only
occasional status, temperature warning and the like so should be well
under any number or rate limits. With no configuration changes here or
changes by me to the gmail account it has suddenly stopped working. A
look at the exim4 log shows the last successful email as:

2019-10-15 12:59:41 1iKLUK-0008Vq-B4 <= nagios@PI05 H=icinga (PI05)
[172.18.20.35] P=smtp S=640
2019-10-15 12:59:42 1iKLUK-0008Vq-B4 => XXXXXXXX.co.uk
 R=smarthost T=remote_smtp_smarthost
H=gmail-smtp-msa.l.google.com [74.125.133.109]
X=TLS1.2:ECDHE_RSA_CHACHA20_POLY1305:256 CV=no
DN="C=US,ST=California,L=Mountain View,O=Google LLC,CN=smtp.gmail.com"
A=plain C="250 2.0.0 OK  1571140782 a10sm21277754wrm.52 - gsmtp"
2019-10-15 12:59:42 1iKLUK-0008Vq-B4 Completed

and the first unsuccessful email as:

2019-10-16 05:15:03 1iKaiE-0001MQ-PH <= nagios@PI05 H=icinga (PI05)
[172.18.20.35] P=smtp S=529
2019-10-16 05:15:04 1iKaiE-0001MQ-PH ** XXXXXXXX.co.uk
 R=smarthost T=remote_smtp_smarthost H=smtp.gmail.com
[173.194.76.108] X=TLS1.2:ECDHE_RSA_CHACHA20_POLY1305:256 CV=yes
DN="C=US,ST=California,L=Mountain View,O=Google
LLC,CN=smtp.gmail.com": SMTP error from remote mail server after
pipelined MAIL FROM: SIZE=1568: 530-5.5.1
Authentication Required. Learn more at\n530 5.5.1
https://support.google.com/mail/?p=WantAuthError r3sm15957872wre.29 -
gsmtp

Does anyone have any ideas on what google have changed and how to fix
it? The web page referenced didn't seem to be relevant leastways it
didn't help me and I can still log into the gmail account on a
different machine with the credentials in the exim4 configuration.
Otherwise are their any suggestions on another free account I can get
to send smtp headless from the pi instead of using google.

Any help gratefully received
thanks
MArtin

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