Setting up Squirrelmail with postfix and devcoot: errors: Authentication not enabled && Relay Access Denied

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issue 1
ERROR:
Message not send Server Replied
Transaction Failed
554.5.7.1 <email>: Relay Access Denied

Solution :
Check hostname of system by command
hostname
vim /etc/postfix/main.cf
check hostname in main.cf file it must be identical as hostname 
Check hostname in /etc/hosts

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issue2
ERROR:
Message not send Server Replied
Temporary authentication failure
454 4.7.1<mail>:Relay access denied

solution:
change smtp_auth to none if it is login in
vim /etc/squirrelmail/config.php


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issue3
ERROR:
Message not send Server Replied
Bad sequence of commands
503 5.5.1<mail>:Authentication not enabled 

solution:
change smtp_auth_mech to none if it is login in
vim /etc/squirrelmail/config.php


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issue4
ERROR: NIS lookup not set. NIS lookup disabled
it appears in maillog

Solution :
vim /etc/squirrelmail/main.cf
line number 382
uncomment
alias_maps = hash:/etc/aliases

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vt-x is not available. (verr_vmx_no_vmx)

You might see this error when some day you run Virtual Box

vt-x is not available. (verr_vmx_no_vmx)

This error is due to occupied VT-X resource by some other program , process or service. Most common reason of this is due to Hyper-V on Windows. You can stop hyper-V services form component services or for permanent solution disable service or UNCHECK it from turn windows program on or off.

Restart. VirtualBox should be fine.