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Generate DKIM, SPF and DMARC

Step 1. Modify DKIM generator

a. Edit (as root) script file /opt/zimbra/libexec/zmdkimkeyutil and replace all ‘2048’ occurrences with ‘1024’.
This will allow creation of DKIM key with length 1024 and set it as default value.

nano /opt/zimbra/libexec/zmdkimkeyutil

replace all 3 ‘2048’ occurrences with ‘1024’ and then save and exit

Step 2. generate a new DKIM, replace with your domain. Please note you’ll need to generate a DKIM for each domain

switch to zimbra user : su – zimbra

/opt/zimbra/libexec/zmdkimkeyutil -a -d

Step 3. Retrieving the stored DKIM data for your domain – replace with your domain
as zimbra user run command below;

/opt/zimbra/libexec/zmdkimkeyutil -q -d

[email protected]:~$ /opt/zimbra/libexec/zmdkimkeyutil -a -d
DKIM Data added to LDAP for domain with selector 0E9F184A-9577-11E1-AD0E-2A2FBBAC6BCB
Public key to enter into DNS:
5gegRR34-6456-1212d-ss34-fds34wefwr4._domainkey IN TXT “v=DKIM1;=rsa;

Step 4.
highlight and copy: 0E9F184A-9577-11E1-AD0E-2A2FBBAC6BCB._domainkey

highlight and copy: v=DKIM1; k=rsa;


Step 5. verify DKIM key using this link

Step 6.

– login to your DNS web portal
– create new TXT entry

– add the 0E9F184A-9577-11E1-AD0E-2A2FBBAC6BCB._domainkey in the hostname field

– add the public DKIM key into destination / target field

for SPF

Create SPF

create new TXT entry
hostname = @
rDATA = v=spf1 mx ip4: ~all


create new TXT entry
hostname = _dmarc
rDATA = v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]

create new TXT entry
hostname =
rDATA = v=DMARC1; ruf=mailto:[email protected]




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