How to remove your IP from SINGULARis (TTK)

A small university-run blocklist that will still bounce your mail to the PTE Faculty of Sciences. Here is what a listing means and how to clear it.

Check your domain free → SINGULARis (TTK) removal tool ↗

What it is

The list, in plain terms.

SINGULARis is the spam and scam e-mail blocklist run by the Faculty of Sciences (TTK) of the University of Pécs (PTE) in Hungary, through its Computing Services Centre. It has been operational since May 2014 and is published as the DNS zone singular.ttk.pte.hu. The list holds two kinds of object: sender e-mail addresses and sender or relay IP addresses.

It is a niche, self-run list. Its main purpose is to protect the faculty's own mail from e-mail floods and phishing, so it is rarely consulted by large mailbox providers. If your mail to a University of Pécs Faculty of Sciences address is being deferred or rejected, this is the list to check; it is unlikely to be the cause of wider delivery problems elsewhere.

This guide covers the IP side of the list. A listing means the sending server's IP has been flagged, not the domain in your message, so the fix is applied to the machine that sent the mail.

Why you get listed

What a listing on SINGULARis (TTK) means.

Detected in the faculty's mail statistics The operator flags IPs from its own internal e-mail statistics and brute-force log data — patterns consistent with floods, abuse or credential attacks against faculty systems.

Hit a spam trap Mail from the IP reached one of the operator's trap addresses, which no legitimate sender should be mailing.

Reported by users Recipients inside the faculty reported the mail as spam or scam, and the operator added the source.

A misconfigured or compromised server The operator names open relays, hacked user accounts and configuration errors as the usual causes. The IP is often relaying abuse rather than sending it deliberately.

How to get removed

Delisting, in order.

Removal is free. Fix the cause first — a listing you clear without a fix comes straight back.

1 Fix the cause first. Close any open relay, secure or reset compromised accounts, and correct the mail configuration before you ask for removal. The operator warns that delisting does not stop you being relisted if the abuse continues.
2 Look your IP up on the removal page. Go to the SINGULARis lookup and removal page and check the IP. If the mail bounced, the standard error notice from the faculty's system also links straight to this page.
3 Complete the delisting challenge. Self-service removal requires solving the operator's captcha, described as a "fighting fantasy game". Complete it to request removal for a clean IP.
4 Ask for manual delisting if you cannot solve it. If you are unable to complete the challenge, contact the operator directly and ask for manual delisting. Removal is free — no third party can do this for you.
5 Wait for the listing to clear, then re-check. After a successful delisting, blockings at the faculty expire within about 10 minutes; on remote systems that use the list expiry is up to about an hour unless the local operator has overridden it. Re-check before resuming sending.

The official route

Straight to the source.

Removal happens on SINGULARis (TTK)'s own tool — never through a paid service.

SINGULARis (TTK) removal tool ↗

How long it takes

Automatically listed entries are dropped on their own after 42 inactive days. If you delist manually, blockings at the faculty expire within about 10 minutes and on remote systems within about an hour, unless a local operator has overridden the list. Removal without fixing the cause is temporary — the abuse patterns will relist the IP.

Common questions

About SINGULARis (TTK), specifically.

What is singular.ttk.pte.hu? It is the DNS zone of SINGULARis, the spam and scam blocklist run by the University of Pécs Faculty of Sciences (PTE TTK) in Hungary. It lists sender e-mail addresses and relay IPs, mainly to protect the faculty's own mail from floods and phishing.

Does SINGULARis charge to remove my IP? No. Removal is free on the operator's own lookup and removal page. Any service offering to clear a SINGULARis listing for a fee is a scam — no outside party can influence this list.

How do I delist my IP? Fix the cause first, then look the IP up on the removal page and complete the operator's captcha, described as a "fighting fantasy game", to request removal. If you cannot solve the challenge, contact the operator for manual delisting.

How long does removal take? After a successful delisting, blockings at the faculty expire within about 10 minutes and on remote systems within about an hour, unless the remote operator has overridden the list. Automatic listings that go quiet drop after 42 inactive days on their own.

I delisted but got listed again — why? Because the cause is still there. The operator warns that delisting does not prevent relisting if the spamming, scamming or abuse continues. Close the open relay, secure the compromised account, or fix the configuration, then delist.

Should I worry about SINGULARis for my general deliverability? Usually not. It is a small university-run list used mainly for the faculty's own mail, so it rarely affects delivery to large providers. It matters when your mail to a University of Pécs Faculty of Sciences address is being rejected.

The bounce behind the listing.

554 5.7.1 message rejected → The permanent bounce a listing most often triggers — what it means and how to clear it. 550 5.7.1 blocked → A rejection on reputation grounds — usually the same listing, seen from the sender side. Blacklist checker → Re-check your domain and every sending IP once the cause is fixed.

Do not fix it blind.

See every list you are on and every authentication problem behind the listing in one 40-second check — then let monitoring tell you the day a listing comes back.

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