Unable to install on Ubuntu 16.04 LTS

Hit:1ttp://in.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 ttp://in.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:3 ttp://in.archive.ubuntu.com/ubuntu xenial-backports InRelease
Get:4 ttp://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Fetched 109 kB in 1s (84.5 kB/s)
Reading package lists…
Reading package lists…
Building dependency tree…
Reading state information…
build-essential is already the newest version (12.1ubuntu2).
libffi-dev is already the newest version (3.2.1-4).
python3-dev is already the newest version (3.5.1-3).
python3-setuptools is already the newest version (20.7.0-1).
git is already the newest version (1:2.7.4-0ubuntu1.9).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up postfix (3.1.0-3ubuntu0.3) …

Postfix configuration was untouched. If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed. To view Postfix configuration
values, see postconf(1).

After modifying main.cf, be sure to run ‘/etc/init.d/postfix reload’.

Running newaliases
newaliases: warning: valid_hostname: misplaced delimiter: aditya-X551CAP…name
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad parameter value: aditya-X551CAP…name
dpkg: error processing package postfix (–configure):
subprocess installed post-installation script returned error exit status 75
Processing triggers for libc-bin (2.23-0ubuntu11.2) …
Errors were encountered while processing:
Install script run at 11:12 on 2020-07-12

This is the log file

What command(s) were you running when this error occurred?

try installing postfix again manually. if the install goes successfully, you can run the script again.