This is the mail system at host ip-172-30-1-14.ap-northeast-1.compute.internal.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<idolpm@gmail.com>: host gmail-smtp-in.l.google.com[74.125.204.26] said:
550-5.7.26 Your email has been blocked because the sender is
unauthenticated. 550-5.7.26 Gmail requires all senders to authenticate with
either SPF or DKIM. 550-5.7.26 550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass 550-5.7.26 SPF [pm.fdol.jp] with ip:
[54.250.79.15] = did not pass 550-5.7.26 550-5.7.26 For instructions on
setting up authentication, go to 550 5.7.26
https://support.google.com/mail/answer/81126#authentication
d9443c01a7336-223502919edsi47582305ad.189 - gsmtp (in reply to end of DATA
command)

This is the mail system at host ip-172-30-1-13.ap-northeast-1.compute.internal.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<idolpm@gmail.com>: host gmail-smtp-in.l.google.com[64.233.189.26] said:
550-5.7.26 Your email has been blocked because the sender is
unauthenticated. 550-5.7.26 Gmail requires all senders to authenticate with
either SPF or DKIM. 550-5.7.26 550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass 550-5.7.26 SPF [pm.fdol.jp] with ip:
[57.180.243.174] = did not pass 550-5.7.26 550-5.7.26 For instructions on
setting up authentication, go to 550 5.7.26
https://support.google.com/mail/answer/81126#authentication
98e67ed59e1d1-2fea696e501si4388322a91.106 - gsmtp (in reply to end of DATA
command)