ProxMailcow/mailcow/post-install.md

Mailcow Post-Installation Steps

Access Mailcow admin: https://mail.web.orbishosting.com
Default login: admin / moohoo

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Step 1: Change Admin Password

Configuration → Access → Administrator accounts → admin → Edit

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Step 2: Add Your Domain

Configuration → Mail Setup → Domains → Add domain

Field	Value
Domain	web.orbishosting.com
Description	Orbis Hosting Mail
Max. aliases	400
Max. mailboxes	10 (adjust as needed)
Max. quota	10240 MB
Default mailbox quota	1024 MB
Active	On

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Step 3: Create Mailboxes

Configuration → Mail Setup → Mailboxes → Add mailbox

Suggested mailboxes to create:

• admin@web.orbishosting.com
• postmaster@web.orbishosting.com (required for RFC compliance)
• abuse@web.orbishosting.com (required for RFC compliance)
• Your personal email address

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Step 4: Get DKIM Key

Configuration → Domains → web.orbishosting.com → DKIM

Click Generate if no key exists, then copy the TXT record and add it to your DNS:

dkim._domainkey.web.orbishosting.com  TXT  "v=DKIM1; k=rsa; p=YOURKEY..."

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Step 5: Verify Mail Configuration

Configuration → Diagnostics — Run all checks and ensure green on:

• DNS MX record
• SPF record
• DMARC record
• Reverse DNS (PTR)
• DKIM

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Step 6: Configure Mail Clients

Use these settings for Outlook, Thunderbird, Apple Mail, etc.:

Incoming Mail (IMAP)

Setting	Value
Server	mail.web.orbishosting.com
Port	993
Security	SSL/TLS
Username	full email address (e.g., user@web.orbishosting.com)

Outgoing Mail (SMTP)

Setting	Value
Server	mail.web.orbishosting.com
Port	587
Security	STARTTLS
Authentication	Normal password
Username	full email address

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Step 7: Test Email Deliverability

1. Send a test email from your new mailbox to an external address (Gmail, Outlook)
2. Check spam score: https://www.mail-tester.com
3. Check blacklists: https://mxtoolbox.com/blacklists.aspx

Target score: 10/10 on mail-tester.com

Common issues if score is low:

• Missing PTR record → contact ISP
• Missing DKIM → check Step 4
• Missing DMARC → check dns-records.md
• On a residential ISP blacklist → consider a mail relay (SendGrid, Mailgun) for outbound

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Mailcow Useful Commands

ssh ubuntu@10.48.200.82
cd /opt/mailcow-dockerized

# View all container status
sudo docker compose ps

# View logs for specific container
sudo docker compose logs -f postfix-mailcow
sudo docker compose logs -f dovecot-mailcow
sudo docker compose logs -f acme-mailcow

# Restart all Mailcow containers
sudo docker compose restart

# Update Mailcow
sudo docker compose pull
sudo docker compose up -d

# Update Mailcow (official method)
sudo ./update.sh