# BT-58 Buyer contact email address

Email address for the buyer contact point.

## Quick answer

> **Buyer details**: Who receives the invoice and which buyer records or routing data must match.

- [Validate XML](/en/xrechnung-validator?source=resource&bt=BT-58)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&bt=BT-58)

## In plain language

This helps invoice follow-up reach the right mailbox when the buyer processes invoices centrally.

## What you usually enter here

Email address

Typical valid values include: ap@buyer.example

Optional according to EN 16931-1.

## Where the field sits

BT-58 belongs to the Buyer part of the invoice. UBL 2.1 Syntax: Invoice › cac:AccountingCustomerParty › cac:Party › cac:Contact › cbc:ElectronicMail. CII (UN/CEFACT) Syntax: rsm:CrossIndustryInvoice › rsm:SupplyChainTradeTransaction › ram:ApplicableHeaderTradeAgreement › ram:BuyerTradeParty › ram:DefinedTradeContact › ram:EmailURIUniversalCommunication › ram:URIID.

## What goes wrong often

Avoid values like: not-an-email

## Valid Examples

- ap@buyer.example

## Invalid Examples

- not-an-email

## Related Fields

- [BT-56 Buyer contact point](/resources/xrechnung/bt-56-buyer-contact-point)
- [BT-57 Buyer contact telephone number](/resources/xrechnung/bt-57-buyer-contact-telephone-number)

## XML mapping and field facts

Open the technical reference if you need XML paths, validator rule codes, legal wording, or schema-specific mapping details.

### Field ID:
BT-58

### Data Type:
text

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
100 characters

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:AccountingCustomerParty/cac:Party/cac:Contact/cbc:ElectronicMail
```

### CII (UN/CEFACT) Syntax
```
/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:DefinedTradeContact/ram:EmailURIUniversalCommunication/ram:URIID
```

## Create an XRechnung from your PDF

The converter reads the invoice and shows the fields it found before download, so you can check and correct the values. No PDF? Fill in the XRechnung directly in the form.

- [Convert invoice](/en/pdf-to-xrechnung)
- [Fill in XRechnung in the form](/en/create-xrechnung)

Trying it and buying a single conversion work without an account. Subscriptions from €10/month with annual billing (excl. taxes), or €5 per conversion (excl. taxes) without a subscription.

## Official sources and tools

- [KoSIT Validator](https://erechnungsvalidator.service-bw.de/)
- [XRechnung Standard](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)