Sending issues/errors with MailGun and MailWizz


Today I sent an email to 300 users (cold emails) but I'm not sure if email was sent :/ - seems like all good in the stats of mailWizz but when I check the log in Mailgun here is what I see;

Where is the "remote server" issue? is where Mailwizz is hosted? or is it the email that I tried to send to?

** Update: When I talk to Mailgun support here's their comment: - so, how can I solve this?
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seems like all good in the stats of mailWizz
This means mailwizz was able to take the email from your server and handle it over to mailgun. Here's where our job stops.
Update: When I talk to Mailgun support here's their comment:
In this case, it is the smtp server of the user receiving the email, so if you send to, then they talk about the smtp server for
input_encoding no value no value
internal_encoding no value no value
log_errors On On
log_errors_max_len 1024 1024
mail.add_x_header On On
mail.force_extra_parameters no value no value
mail.log no value no value
max_execution_time 300 300
max_file_uploads 20 20
max_input_nesting_level 64 64
max_input_time 300 300
max_input_vars 1000 1000
memory_limit 256M 256M
open_basedir no value no value
output_buffering no value no value
output_encoding no value no value
output_handler no value no value
post_max_size 8M 8M
precision 14 14
realpath_cache_size 4096K 4096K
realpath_cache_ttl 120 120
register_argc_argv On On
report_memleaks On On
report_zend_debug On On
request_order GP GP
sendmail_from no value no value
sendmail_path /usr/sbin/sendmail -t -i /usr/sbin/sendmail -t -i
serialize_precision 100 100
short_open_tag On On
SMTP localhost localhost
smtp_port 25 25
sys_temp_dir no value no value
syslog.facility LOG_USER LOG_USER
syslog.filter no-ctrl no-ctrl
syslog.ident php php
track_errors Off Off
unserialize_callback_func no value no value
upload_max_filesize 200M 200M
upload_tmp_dir no value no value
user_dir no value no value
user_ini.cache_ttl 300 300
user_ini.filename .user.ini .user.ini
variables_order GPCS GPCS
xmlrpc_error_number 0 0
xmlrpc_errors Off Off
zend.assertions -1 -1
zend.detect_unicode On On
zend.enable_gc On On
zend.multibyte Off Off
zend.script_encoding no value no value
zend.signal_check Off Off
Thanks for the info, unfortunately i don't see the allocated resources, like RAM / CPU.
Since it's shared hosting, these might be very limited and thus they cannot cope with the loading on the server when MG send the requests.
I think you should take this to your hosting company, they'll know better what to do.
Do you wish to host your own SMTP server? if so, that should be on at least a 4GB and 4 CPU server with SSD for storage, and not on same machine as your mailwizz. You can try postal as the smtp server, but be warned, setting up your own smtp server is no easy deal.
If i were you, i'd keep using MG or a 3rd-party provider and switch the hosting for mailwizz to a dedicated vps, same specs as above will do for a good start. If you can't install/setup a vps for mailwizz and then mailwizz, use a service like roboset to do this for you.
I have a quick question. my current set up is as follows. I created a droplet SMTP server via Digital Ocean then I am using Mialwizz. I also signed up for MG to check them out. With my current set up, can I use MG also along with mailwizz? What exactly is the difference between mailwizz and MG?