Feedback help me with email confirmation on xenforo

hi guys
i have use xenforo 2.0 and i have create admin account with yahoo email
now i start create first member for test my site .. and i have use gmail email for this account
when i start create member account after i finish the site send confirmation email to me
i go to my gmail account but i dont find any confirmation email ? for that i can not active me member account if i dont got the confirmation




i have go to my admin email that which use yahoo email and i find this email

Mail delivery failed: returning message to sender

Event:failure

User:ajeeb
Domain:ajeeb.us
From Address:f0f020002000@yahoo.com
Sender:ajeeb
Sent Time:Oct 10, 2017 11:57:23 PM
Sender Host:localhost
Sender IP:127.0.0.1
Authentication:localuser
Spam Score:
Recipient:aj33b3@gmail.com
Delivery User:-system-
Delivery Domain:
Delivered To:
Router:lookuphost
Transport:remote_smtp
Out Time:Oct 10, 2017 11:57:23 PM
ID:1e21ad-0008WH-SV
Delivery Host:gmail-smtp-in.l.google.com
Delivery IP:173.194.69.26
Size:4.68 KB
Result: ECDHE-RSA-AES128-GCM-SHA256:128 CV=yes: SMTP error from remote mail server after end of data: 550-5.7.1 Unauthenticated email from yahoo.com is not accepted due to domain's\n550-5.7.1 DMARC policy. Please contact the administrator of yahoo.com domain if\n550-5.7.1 this was a legitimate mail. Please visit\n550-5.7.1 https://support.google.com/mail/answer/2451690 to learn about the\n550 5.7.1 DMARC initiative. y30si4667388eda.230 - gsmtp

Code (markup):

please i need help with this problem
i can not run my site if this error is there?

 

no
now in xenforo when u registry new account u need to confirmation email but when i visit my gmail i dont find any email confirmation
and also in same time the site send to admin email that error delivery

 

i have send to yahoo
they answer to me this

Thank you for contacting Yahoo Postmaster. I assure you that I'll do my best to help you out.

I'm sorry to hear about the trouble you're facing. The error you received is actually from Google/Gmail. However, Yahoo has a similar error and it's related to Yahoo's DMARC policy. A DMARC policy allows a sender to indicate that their messages are protected by SPF and/or DKIM, and tells a receiver what to do if neither of those authentication methods passes – such as junk or reject the message. DMARC removes guesswork from the receiver’s handling of these failed messages, limiting or eliminating the user’s exposure to potentially fraudulent and harmful messages.

When an email is sent that violates this policy or the system can't verify it came from where it says it did, they may be rejected. For example, if an email claims to be sent from a Yahoo address but wasn't sent using Yahoo's servers, then it may be flagged. If you're sending from a domain to Yahoo, double-check to make sure your DMARC and SPF records are valid. You can look at these links below for more information about the error message and Yahoo's DMARC policy.

Yahoo DMARC policy
https://help.yahoo.com/kb/sln24050.html?impressions=true&i=

Email service providers can't send to/from Yahoo Mail addresses
https://help.yahoo.com/kb/sln24016.html?impressions=true&i=


If you have other questions or details to share, simply reply to this email. We're always happy to help.

 

so what i can do now
how can i make it send from yahoo