v=spf1 a mx ipv4:XXX.XX.XXX.XX -all
v=spf1 include:mydomain.com -all

v=spf1 a mx include:mydomain.com ipv4:XXX.XX.XXX.XX include:cmail1.com include:mail.zendesk.com -all

SPF:    FAIL with IP XXX.XX.XXX.XX
spf=fail (google.com: domain of accounts@mydomain.com does not designate XXX.XX.XXX.XX as permitted sender) smtp.mailfrom=accounts@mydomain.com
Received-SPF: fail (google.com: domain of accounts@mydomain.com does not designate XXX.XX.XXX.XX as permitted sender) client-ip=XXX.XX.XXX.XX;
spf=fail (google.com: domain of accounts@mydomain.com does not designate XXX.XX.XXX.XX as permitted sender) smtp.mailfrom=accounts@mydomain.com