Namecheap mail me - 2

Hello,

We will investigate bouncing problem more deeply, by far,
we would recommend you as a workaround to change your mailin.whoisguardused.domain domain spf record

from:
mailin.whoisguardused.domain. 3600 IN TXT "v=spf1 -all"
to:
mailin.whoisguardused.domain. 3600 IN TXT "v=spf1 ip4:***.187.30.106 -all"

As due to current SPF configuration your domain can not send or receive no mails at all.
As mail server your mailin.whoisguardused.domain domain hosted at checks SPF record for domain it is no mails currently could be delivered to it.
After you will update SPF record the issue will be solved, it only our server will be authorized to send mails to your domain.
Please let us know if you have any further questions

---end of mail body---
---my memo---
Me --> WhosiGuard(WG) [send an email to @whoisprotect, just for test]
WG --> My Mail Server(MSV,mailin.whoisguardused.domain) [Send an email. FROM is My mail address!]
WG <-- MSV [So my mail server reject it, due to SPF violation]
Me <-- WG [send "return mail", this contains MSV's data and real email!!]