==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====OS Ubuntu 18.04-- web Server: Nginx as package in iredmail  backend: maria database standard admin

Hi have installed latest : iRedMail-0.9.8   DNS propogated, MX records Ok A record ok  checked with leafdns.com DKIM seems valid  installed  by iRedmail added to DNS ok.
Can send mail okay   but not Receive mail from other domains

mail check says this:

DKIM Signature

Message contains this DKIM Signature:
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=wordupmail.com;
     h=user-agent:message-id:subject:subject:to:from:from:date:date
    :content-transfer-encoding:content-type:content-type
    :mime-version; s=dkim; t=1538224571; x=1540816572; bh=BVVl/lb09n
    6kCsALDBcj8rLz3kpSXDFGY4J8hYEhDm4=; b=szJZ4UgTjEYz5z9dw2uN1jje1q
    Pofaz78zGTjJRFJVq2pOrqeq/Z6SOf6EoeF4dPGmBogNhqulFJCAC08hZg14mThI
    2BMeA4dkrWhkwo+YTVnh90dtUFRjQ+Lm3xFT2iq3LazjmpyuqE2Vg16Uyj9wT5o1
    dE+kh955bT4t5OtPU=

Signature Information:
v= Version:         1
a= Algorithm:       rsa-sha256
c= Method:          relaxed/simple
d= Domain:          wordupmail.com
s= Selector:        dkim
q= Protocol:       
bh=                 BVVl/lb09n
    6kCsALDBcj8rLz3kpSXDFGY4J8hYEhDm4=
h= Signed Headers:  user-agent:message-id:subject:subject:to:from:from:date:date
    :content-transfer-encoding:content-type:content-type
    :mime-version
b= Data:            szJZ4UgTjEYz5z9dw2uN1jje1q
    Pofaz78zGTjJRFJVq2pOrqeq/Z6SOf6EoeF4dPGmBogNhqulFJCAC08hZg14mThI
    2BMeA4dkrWhkwo+YTVnh90dtUFRjQ+Lm3xFT2iq3LazjmpyuqE2Vg16Uyj9wT5o1
    dE+kh955bT4t5OtPU=
Public Key DNS Lookup

Building DNS Query for dkim._domainkey.wordupmail.com
Retrieved this publickey from DNS: v=DKIM1; p=   MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC0hluP2Wykf5+CbMBf2lucXF5t   2zdcGQxa3fKnhi5n/fAeNKciVR6NhhHraRlMzh+F+6eFc9qZ5Z2a+K6JssdWR3C/   aBoBKxeI70N7/thkvA6sYk5XTJwau+R0MquD2ZmvidwPs7ZLmQ0j+1FmC+cxY+pa   +uKYhvN/WSJPLUMxewIDAQAB
Validating Signature

result = pass
Details:

=====================================

Then we get this:

Result: softfail (Mechanism '~all' matched)

Result code: softfail
Local Explanation: wordupmail.com: Sender is not authorized by default to use 'postmaster@wordupmail.com' in 'mfrom' identity, however domain is not currently prepared for false failures (mechanism '~all' matched)
spf_header = Received-SPF: softfail (wordupmail.com: Sender is not authorized by default to use 'postmaster@wordupmail.com' in 'mfrom' identity, however domain is not currently prepared for false failures (mechanism '~all' matched)) receiver=dkimvalidator.com; identity=mailfrom; envelope-from="postmaster@wordupmail.com"; helo=mailme.wordupmail.com; client-ip=199.247.3.000

===================================

SpamAssassin Score: 0.563
Message is NOT marked as spam
Points breakdown:
0.1 DKIM_SIGNED            Message has a DKIM or DK signature, not necessarily valid
0.4 RDNS_DYNAMIC           Delivered to internal network by host with
                            dynamic-looking rDNS

0.1 DKIM_INVALID           DKIM or DK signature exists, but is not valid       

==================================

Dkim not valid    can someone please tell me what is happening and how to fix it please  have tried most suggestions on forums and google still wont work any help would be appreciate Thanks