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Mail server fix for "MTA poor reputation" error

We implemented a new mail server a few months ago and since then our e-mails are returned with an error when sending to some places:

"554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means."

We do not send spam and do not use our emails for telemarketing. Strictly business.

We went on the net already and applied a few fixes but it's still there.

What we need is someone with experience to give us guidelines on how to fix this.

We will then implement what is needed and report back to you on the results.

Thank you

Skills: Email Handling, System Admin

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About the Employer:
( 34 reviews ) Lachine, Canada

Project ID: #15439614

14 freelancers are bidding on average $76 for this job

vili1977

fix 554 error Relevant Skills and Experience postfix Proposed Milestones $55 USD - fix 554 error

$55 USD in 1 day
(240 Reviews)
6.2
stoyanovalexandr

Hello, I am a skilled unix and network engineer with 5 years of experience in unix based systems, virtualization like proxmox,esxi,xen,virsh, iptv,zimbra etc. I like to automate system working with additional shell scr More

$55 USD in 1 day
(63 Reviews)
5.6
$50 USD in 2 days
(22 Reviews)
5.1
nizamec2012

Hello, Please share more information so that I can check & fix the issue. Thank you Relevant Skills and Experience Sever admin Proposed Milestones $77 USD - Project

$45 USD in 3 days
(49 Reviews)
4.8
kuldeepvk

hey iam server admin and have 9 years working experience in server Relevant Skills and Experience mailing server experience Proposed Milestones $77 USD - provide me server details

$77 USD in 1 day
(38 Reviews)
5.0
numerichost

Hi, I have about 10 years experience in linux administration, i prefer to work with web hosting control panels like cpanel, plesk, , zpanel etc Relevant Skills and Experience powermta,interspire,mailwiz etc Proposed More

$66 USD in 1 day
(21 Reviews)
4.6
Mondorica

I can handle this task. Relevant Skills and Experience linux Proposed Milestones $88 USD - your mts issue let me know

$88 USD in 3 days
(7 Reviews)
3.5
redssr

How do you manage your email A/C(s), means are you using any web panel to mange your A/C(s) or you have only shell access to the server. What's the score of your mail server at [url removed, login to view] Do your mail serv More

$80 USD in 3 days
(15 Reviews)
3.3
debianguy

Hi, I can help you improving your mail server score without problem I've worked with mail servers from long time ago. I'm postfix expert There are an excellent online tool for test your email reputation, you can More

$45 USD in 2 days
(2 Reviews)
2.1
CoWind

I am new at this site and have no much reputation, but i am very experienced system administrator. I can do this job well.

$55 USD in 3 days
(1 Review)
1.4
vladimirtechguy

Hello! Looks like problem in IP's we have such of experiance and can help with this, you can contact vie here via chat Relevant Skills and Experience System Admin Linux admin Proposed Milestones $155 USD - mail s More

$155 USD in 3 days
(0 Reviews)
0.0
sergrych1973

on DNS - PTR, DKIM, SPF, DMARK - all ok? Stay tuned, I'm still working on this proposal.

$55 USD in 3 days
(0 Reviews)
0.0
reesv01

I can provide advise on how to get this sorted. I've dealt with many similar issues with various customers. I can also advise of further imrpovements to secure and make your e-mails more reliable. Relevant Skills and More

$155 USD in 3 days
(0 Reviews)
0.0
cloud081992

A proposal has not yet been provided

$77 USD in 1 day
(0 Reviews)
0.0