Here is logged message for your email by MTA(mail transfer agent).
to=<*****@gmail.com>, relay=gmail-smtp-in.l.google.com[142.250.157.27]:25, delay=1.1, 
delays=0.04/0.02/0.54/0.49, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[142.250.157.27] 
said: 550-5.7.1 [160.16.56.243      12] Our system has detected that this message is 550-5.7.1 likely 
unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. 
Please visit 550-5.7.1  https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1 
 for more information. s2-20020a656902000000b003808c37fab3si4717057pgq.658 
- gsmtp (in reply to end of DATA command))
Gmail thinking, your email will be spam.
--
安冨 伸浩 (マイサイト管理人)