Mail blocked by Google

[אורי]

Hi,

I have an Ubuntu server which sends mail to me daily, and until recently I
received the mail without problems. But recently, mail from the server to
my email address (which is powered by Google) is blocked with the following
error messages:

May 16 04:00:01 www postfix/smtp[1364]: 79264BD01C: to=<
webmaster+root-crontab at speedy.net>, relay=aspmx.l.google.com[142.250.27.27]:25,
delay=0.13, delays=0.02/0.01/0.02/0.07, dsn=5.7.1, status=bounced (host
aspmx.l.google.com[142.250.27.27] said: 550-5.7.1 [157.245.76.159      18]
Our system has detected that this message is 550-5.7.1 likely suspicious
due to the very low reputation of the sending IP 550-5.7.1 address. To best
protect our users from spam, the message has been 550-5.7.1 blocked. Please
visit 550 5.7.1  https://support.google.com/mail/answer/188131 for more
information. bo27si207201edb.287 - gsmtp (in reply to end of DATA command))

The IP of the server is 157.245.76.159, the sender is
root at www.speedypedia.info and SPF is defined. Is there a way to receive
mail from this server, without using another SMTP server to send mail? This
server only sends mail to myself and I never marked it as spam.

Thanks,

אורי
uri at speedy.net
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